🕷️ Crawler Inspector

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Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 154 (from laksa167)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa154.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://mimo.org/glossary/javascript/function-name\')), getAhrefsUnparsedNoserviceFromURL(\'https://mimo.org/glossary/javascript/function-name\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/mimo.org\/glossary\/javascript\/function-name","crawl_time":1776217636,"first_indexed_time":1675732815,"http_code":200,"src_unparsed":"org,mimo!\/glossary\/javascript\/function-name s443","src_root_hash":"8895701236557990354","history_drop_reason":null,"meta_title":"JavaScript function name: Define and call functions","meta_descriptions":["Explore JavaScript function names to define reusable code blocks, pass parameters, and enhance code organization."],"attrs_boilerpipe_text":"JavaScript Function Name: Syntax, Usage, and Examples\nA JavaScript function name identifies a block of reusable code. It’s how you reference and call a function later in your program.\nHow to Use a Function Name in JavaScript\nThe basic syntax of a named function in\nJavaScript\nlooks like this:\nJSX\nfunction\ngreetUser\n(\n) {\nconsole\n.\nlog\n(\n\"Hello!\"\n);\n}\nThe function name here is\ngreetUser\n. It follows the camel case naming convention: lowercase first word, uppercase first letter of each subsequent word.\nYou can then call the function using its name, followed by parentheses:\nJSX\ngreetUser\n();\n\/\/ Output: Hello!\nFunction names are case-sensitive and must begin with a letter, underscore\n_\n, or dollar sign\n$\n. Digits are allowed, but not at the beginning.\nWhen to Use a Function Name in JavaScript\nFunction names in JavaScript are important for organizing and reusing code. Use them when:\n1. Repeating Logic\nIf you need to perform the same task multiple times, wrap it in a function and name it.\nJSX\nfunction\ncalculateTotal\n(\nprice, tax\n) {\nreturn\nprice + price * tax;\n}\nYou can now reuse this logic whenever needed.\n2. Making Code More Readable\nDescriptive names help you understand what a\nblock of code\nis doing at a glance.\nJSX\nfunction\nfetchUserData\n(\n) {\n\/\/ ...\n}\nCompare this to using anonymous or poorly named functions, it’s much harder to understand quickly.\n3. Structuring Larger Applications\nNamed functions make it easier to break complex logic into smaller, understandable pieces. You might have a file with several related functions:\nJSX\nfunction\nvalidateEmail\n(\nemail\n) { ... }\nfunction\nregisterUser\n(\nuser\n) { ... }\nfunction\nshowWelcomeMessage\n(\n) { ... }\nEach of these is easy to identify and manage.\nExamples of Function Names in JavaScript\nExample 1: Greeting a User\nJSX\nfunction\ngreetUser\n(\nname\n) {\nconsole\n.\nlog\n(\n`Hello,\n${name}\n!`\n);\n}\ngreetUser\n(\n\"Lee\"\n);\n\/\/ Output: Hello, Lee!\nThis is a simple, reusable pattern for personal greetings.\nExample 2: Logging a Timestamp\nJSX\nfunction\nlogCurrentTime\n(\n) {\nconst\nnow =\nnew\nDate\n();\nconsole\n.\nlog\n(\n\"Current time:\"\n, now.\ntoLocaleTimeString\n());\n}\nlogCurrentTime\n();\nClear naming helps describe exactly what this function does.\nExample 3: Math Utility\nJSX\nfunction\nsquare\n(\nnum\n) {\nreturn\nnum * num;\n}\nconsole\n.\nlog\n(\nsquare\n(\n4\n));\n\/\/ Output: 16\nShort, accurate function names like\nsquare\nmake utility functions easy to use and understand.\nLearn More About JavaScript Function Names\nJavaScript Function Name Best Practices\nFollowing consistent naming conventions makes your code easier to read and maintain. Most developers use camel case for function names:\nJSX\nfunction\ngetUserData\n(\n) { ... }\nfunction\nsendEmailNotification\n(\n) { ... }\nAvoid abbreviations that make code harder to understand:\nJSX\nfunction\ngU\n(\n) { ... }\n\/\/ Not clear\nChoose names that describe what the function does.\nReserved Words and Naming Restrictions\nYou can't use JavaScript reserved words like\nfunction\n,\nreturn\n, or\nclass\nas function names.\nThese are invalid:\nJSX\nfunction\nreturn\n(\n) { ... }\n\/\/ ❌ Syntax error\nFunction names also can’t begin with numbers:\nJSX\nfunction\n123start() { ... }\n\/\/ ❌ Invalid\nBut these are valid:\nJSX\nfunction\n_initApp\n(\n) { ... }\nfunction\n$fetchData\n(\n) { ... }\nFunction Expression Naming\nNot all functions require a name. JavaScript allows anonymous functions:\nJSX\nconst\nlogHello =\nfunction\n(\n) {\nconsole\n.\nlog\n(\n\"Hello\"\n);\n};\nHere,\nlogHello\nis a variable name, not the function name itself. But you can still give the function an internal name:\nJSX\nconst\nlogHello =\nfunction\nlogMessage\n(\n) {\nconsole\n.\nlog\n(\n\"Hello\"\n);\n};\nThis can help with debugging stack traces, although it’s not common unless you're writing more advanced JavaScript.\nArrow Functions and Naming\nArrow functions are anonymous by default. When you assign one to a variable, the name of the function is derived from the variable name:\nJSX\nconst\nsayHi\n= (\n) => {\nconsole\n.\nlog\n(\n\"Hi!\"\n);\n};\nHere,\nsayHi\nbecomes the function name implicitly.\nThe\nname\nProperty of a Function\nEvery function in JavaScript has a\nname\nproperty:\nJSX\nfunction\ngreetUser\n(\n) {}\nconsole\n.\nlog\n(greetUser.\nname\n);\n\/\/ Output: greetUser\nconst\nshowDate\n= (\n) => {};\nconsole\n.\nlog\n(showDate.\nname\n);\n\/\/ Output: showDate\nThis can be useful for logging or debugging.\nNaming Async Functions\nIf your function performs asynchronous work, include\nasync\nin the function name when possible to make it obvious:\nJSX\nasync\nfunction\nfetchUserProfile\n(\n) {\nconst\nresponse =\nawait\nfetch\n(\n\"\/profile\"\n);\nreturn\nresponse.\njson\n();\n}\nThis isn’t required, but naming conventions like this can help prevent confusion later.\nFunctions Inside Objects\nFunction names can also appear as part of object methods:\nJSX\nconst\nuser = {\nsayHello\n:\nfunction\n(\n) {\nconsole\n.\nlog\n(\n\"Hello!\"\n);\n  }\n};\nIn ES6 shorthand:\nJSX\nconst\nuser = {\nsayHello\n(\n) {\nconsole\n.\nlog\n(\n\"Hello!\"\n);\n  }\n};\nIn both cases,\nsayHello\nis the function name in JavaScript.\nFunctions in Classes\nInside a class, function names become methods:\nJSX\nclass\nUser\n{\ngreet\n(\n) {\nconsole\n.\nlog\n(\n\"Hi!\"\n);\n  }\n}\nHere,\ngreet\nis the function name inside the class context.","attrs_markdown":"![facebook pixel](https:\/\/www.facebook.com\/tr?id=122284345036528&ev=PageView&noscript=1)\n\nLearn\n\n[Build](https:\/\/mimo.org\/build)\n\nResources\n\n[Pricing](https:\/\/mimo.org\/pro)\n\n[Log in](https:\/\/mimo.org\/web\/login)\n\n[Sign up for free](https:\/\/mimo.org\/web\/register)\n\nLearn\n\nCAREER PATHS\n\n[Full-Stack Development](https:\/\/mimo.org\/courses\/full-stack-development)[Front-End Development](https:\/\/mimo.org\/courses\/front-end-development)[Back-End Development](https:\/\/mimo.org\/courses\/back-end-development)[Python Development](https:\/\/mimo.org\/courses\/python-development)\n\nCOURSES\n\n[HTML](https:\/\/mimo.org\/courses\/learn-html)[JavaScript](https:\/\/mimo.org\/courses\/learn-javascript)[React](https:\/\/mimo.org\/courses\/learn-react)[SQL](https:\/\/mimo.org\/courses\/learn-sql)\n\n[CSS](https:\/\/mimo.org\/courses\/learn-css)[Typescript](https:\/\/mimo.org\/courses\/learn-typescript)[Python](https:\/\/mimo.org\/courses\/learn-python)[Swift](https:\/\/mimo.org\/courses\/learn-swift-programming)\n\nResources\n\n[Glossary](https:\/\/mimo.org\/glossary\/html)[Tutorials](https:\/\/mimo.org\/tutorials\/html)[Learner stories](https:\/\/mimo.org\/learner-stories)[Blog](https:\/\/mimo.org\/blog)\n\n[Pricing](https:\/\/mimo.org\/pro)\n\nDownload\n\nCoding Glossary\n\n[HTML](https:\/\/mimo.org\/glossary\/html)\n\n[CSS](https:\/\/mimo.org\/glossary\/css)\n\n[JavaScript](https:\/\/mimo.org\/glossary\/javascript)\n\n[Python](https:\/\/mimo.org\/glossary\/python)\n\n[Swift](https:\/\/mimo.org\/glossary\/swift)\n\n[TypeScript](https:\/\/mimo.org\/glossary\/typescript)\n\n[SQL](https:\/\/mimo.org\/glossary\/sql)\n\n[React](https:\/\/mimo.org\/glossary\/react)\n\n[Programming Concepts](https:\/\/mimo.org\/glossary\/programming-concepts)\n\nJavaScript Glossary\n\n[HTML](https:\/\/mimo.org\/glossary\/html)[CSS](https:\/\/mimo.org\/glossary\/css)\n\n[JavaScript](https:\/\/mimo.org\/glossary\/javascript)\n\n[Python](https:\/\/mimo.org\/glossary\/python)[Swift](https:\/\/mimo.org\/glossary\/swift)[TypeScript](https:\/\/mimo.org\/glossary\/typescript)[SQL](https:\/\/mimo.org\/glossary\/sql)[React](https:\/\/mimo.org\/glossary\/react)[Programming Concepts](https:\/\/mimo.org\/glossary\/programming-concepts)\n\n## All Terms & Concepts\n- [What is JavaScript?](https:\/\/mimo.org\/glossary\/javascript)\n- [Array() find](https:\/\/mimo.org\/glossary\/javascript\/array-find)\n- [\\-- operator](https:\/\/mimo.org\/glossary\/javascript\/minus-minus-operator)\n- [\\-= operator](https:\/\/mimo.org\/glossary\/javascript\/minus-equal-operator)\n- [\\++ operator](https:\/\/mimo.org\/glossary\/javascript\/plus-plus-operator)\n- [\\+= operator](https:\/\/mimo.org\/glossary\/javascript\/+=-operator)\n- [Accessing and setting content](https:\/\/mimo.org\/glossary\/javascript\/accessing-and-setting-content)\n- [AND operator](https:\/\/mimo.org\/glossary\/javascript\/and-operator)\n- [Array concat() method](https:\/\/mimo.org\/glossary\/javascript\/array-concatenation)\n- [Array indexOf()](https:\/\/mimo.org\/glossary\/javascript\/array-indexof-method)\n- [Array length](https:\/\/mimo.org\/glossary\/javascript\/array-length)\n- [Array pop()](https:\/\/mimo.org\/glossary\/javascript\/array-pop)\n- [Array shift](https:\/\/mimo.org\/glossary\/javascript\/array-shift)\n- [Array slice() method](https:\/\/mimo.org\/glossary\/javascript\/array-slice)\n- [Arrays](https:\/\/mimo.org\/glossary\/javascript\/arrays)\n- [Arrow function](https:\/\/mimo.org\/glossary\/javascript\/arrow-function)\n- [Async await](https:\/\/mimo.org\/glossary\/javascript\/async-await)\n- [Booleans](https:\/\/mimo.org\/glossary\/javascript\/booleans)\n- [Braces](https:\/\/mimo.org\/glossary\/javascript\/braces)\n- [Callback function](https:\/\/mimo.org\/glossary\/javascript\/callback-function)\n- [Calling the function](https:\/\/mimo.org\/glossary\/javascript\/calling-the-function)\n- [Class](https:\/\/mimo.org\/glossary\/javascript\/class)\n- [Closure](https:\/\/mimo.org\/glossary\/javascript\/closure)\n- [Code block](https:\/\/mimo.org\/glossary\/javascript\/code-block)\n- [Comment](https:\/\/mimo.org\/glossary\/javascript\/comment)\n- [Conditions](https:\/\/mimo.org\/glossary\/javascript\/conditions)\n- [Console](https:\/\/mimo.org\/glossary\/javascript\/console)\n- [const](https:\/\/mimo.org\/glossary\/javascript\/const)\n- [Constructor](https:\/\/mimo.org\/glossary\/javascript\/constructor)\n- [Creating a p element](https:\/\/mimo.org\/glossary\/javascript\/creating-a-p-element)\n- [Data types](https:\/\/mimo.org\/glossary\/javascript\/data-types)\n- [Date getTime()](https:\/\/mimo.org\/glossary\/javascript\/date-gettime)\n- [Destructuring](https:\/\/mimo.org\/glossary\/javascript\/destructuring)\n- [DOM](https:\/\/mimo.org\/glossary\/javascript\/dom)\n- [Else](https:\/\/mimo.org\/glossary\/javascript\/else)\n- [Else if](https:\/\/mimo.org\/glossary\/javascript\/else-if)\n- [Enum](https:\/\/mimo.org\/glossary\/javascript\/enum)\n- [Environment](https:\/\/mimo.org\/glossary\/javascript\/environment)\n- [Equals operator](https:\/\/mimo.org\/glossary\/javascript\/equality-operator)\n- [Error Handling](https:\/\/mimo.org\/glossary\/javascript\/error-handling)\n- [ES6](https:\/\/mimo.org\/glossary\/javascript\/es6)\n- [Event listener method](https:\/\/mimo.org\/glossary\/javascript\/event-listener-method)\n- [Event loop](https:\/\/mimo.org\/glossary\/javascript\/event-loop)\n- [Events](https:\/\/mimo.org\/glossary\/javascript\/events)\n- [Export statement](https:\/\/mimo.org\/glossary\/javascript\/export-statement)\n- [Extends](https:\/\/mimo.org\/glossary\/javascript\/extends)\n- [Fetch API](https:\/\/mimo.org\/glossary\/javascript\/fetch-api)\n- [Filter](https:\/\/mimo.org\/glossary\/javascript\/filter)\n- [For loop](https:\/\/mimo.org\/glossary\/javascript\/for-loops)\n- [forEach()](https:\/\/mimo.org\/glossary\/javascript\/foreach)\n- [Function](https:\/\/mimo.org\/glossary\/javascript\/function)\n- [Function bind()](https:\/\/mimo.org\/glossary\/javascript\/function-bind-method)\n- [Function name](https:\/\/mimo.org\/glossary\/javascript\/function-name)\n- [Greater than](https:\/\/mimo.org\/glossary\/javascript\/greater-than)\n- [Head element](https:\/\/mimo.org\/glossary\/javascript\/head-element)\n- [Hoisting](https:\/\/mimo.org\/glossary\/javascript\/hoisting)\n- [If statement](https:\/\/mimo.org\/glossary\/javascript\/if-statement)\n- [Import statement](https:\/\/mimo.org\/glossary\/javascript\/import-statement)\n- [includes()](https:\/\/mimo.org\/glossary\/javascript\/includes-method)\n- [Infinity property](https:\/\/mimo.org\/glossary\/javascript\/infinity-property)\n- [isNaN function](https:\/\/mimo.org\/glossary\/javascript\/isnan-function)\n- [Iterator](https:\/\/mimo.org\/glossary\/javascript\/iterator)\n- [JSON](https:\/\/mimo.org\/glossary\/javascript\/json)\n- [Less than](https:\/\/mimo.org\/glossary\/javascript\/less-than)\n- [Let](https:\/\/mimo.org\/glossary\/javascript\/let)\n- [Local storage](https:\/\/mimo.org\/glossary\/javascript\/local-storage)\n- [Map](https:\/\/mimo.org\/glossary\/javascript\/map)\n- [Methods](https:\/\/mimo.org\/glossary\/javascript\/methods)\n- [Module](https:\/\/mimo.org\/glossary\/javascript\/module)\n- [Modulo operator](https:\/\/mimo.org\/glossary\/javascript\/modulo-operator)\n- [Node.js](https:\/\/mimo.org\/glossary\/javascript\/nodejs)\n- [null](https:\/\/mimo.org\/glossary\/javascript\/null)\n- [Numbers](https:\/\/mimo.org\/glossary\/javascript\/numbers)\n- [Object](https:\/\/mimo.org\/glossary\/javascript\/object)\n- [Object.keys()](https:\/\/mimo.org\/glossary\/javascript\/object-keys-method)\n- [Optional chaining](https:\/\/mimo.org\/glossary\/javascript\/optional-chaining)\n- [Overriding methods](https:\/\/mimo.org\/glossary\/javascript\/overriding-methods)\n- [Parameters](https:\/\/mimo.org\/glossary\/javascript\/parameters)\n- [Promises](https:\/\/mimo.org\/glossary\/javascript\/promises)\n- [Prototype](https:\/\/mimo.org\/glossary\/javascript\/prototype)\n- [Random](https:\/\/mimo.org\/glossary\/javascript\/random)\n- [Reduce](https:\/\/mimo.org\/glossary\/javascript\/reduce)\n- [Regex](https:\/\/mimo.org\/glossary\/javascript\/regex)\n- [Regular expressions](https:\/\/mimo.org\/glossary\/javascript\/regular-expressions)\n- [Removing an element](https:\/\/mimo.org\/glossary\/javascript\/removing-an-element)\n- [Replace](https:\/\/mimo.org\/glossary\/javascript\/replace)\n- [Scope](https:\/\/mimo.org\/glossary\/javascript\/scope)\n- [Session storage](https:\/\/mimo.org\/glossary\/javascript\/session-storage)\n- [setInterval](https:\/\/mimo.org\/glossary\/javascript\/setinterval)\n- [setTimeout() method](https:\/\/mimo.org\/glossary\/javascript\/settimeout)\n- [Sleep() function](https:\/\/mimo.org\/glossary\/javascript\/sleep-function)\n- [Sort](https:\/\/mimo.org\/glossary\/javascript\/sort)\n- [Splice](https:\/\/mimo.org\/glossary\/javascript\/splice)\n- [Spread operator](https:\/\/mimo.org\/glossary\/javascript\/spread-operator)\n- [String](https:\/\/mimo.org\/glossary\/javascript\/strings)\n- [String concat()](https:\/\/mimo.org\/glossary\/javascript\/string-concatenation)\n- [String indexOf()](https:\/\/mimo.org\/glossary\/javascript\/string-indexof-method)\n- [String slice() method](https:\/\/mimo.org\/glossary\/javascript\/string-slice)\n- [Substring](https:\/\/mimo.org\/glossary\/javascript\/substring)\n- [Switch statement](https:\/\/mimo.org\/glossary\/javascript\/switch-statement)\n- [Template literals](https:\/\/mimo.org\/glossary\/javascript\/template-literals)\n- [Ternary operator](https:\/\/mimo.org\/glossary\/javascript\/ternary-operator)\n- [throw Statement](https:\/\/mimo.org\/glossary\/javascript\/throw-error)\n- [Title](https:\/\/mimo.org\/glossary\/javascript\/title)\n- [Try catch](https:\/\/mimo.org\/glossary\/javascript\/try-catch)\n- [Type conversion](https:\/\/mimo.org\/glossary\/javascript\/type-conversion)\n- [undefined](https:\/\/mimo.org\/glossary\/javascript\/undefined)\n- [var](https:\/\/mimo.org\/glossary\/javascript\/var)\n- [void Operator](https:\/\/mimo.org\/glossary\/javascript\/void-operator)\n- [While loop](https:\/\/mimo.org\/glossary\/javascript\/while-loops)\n\nJAVASCRIPT\n\n# JavaScript Function Name: Syntax, Usage, and Examples\nA JavaScript function name identifies a block of reusable code. It’s how you reference and call a function later in your program.\n\n## How to Use a Function Name in JavaScript\nThe basic syntax of a named function in [JavaScript](https:\/\/mimo.org\/glossary\/javascript) looks like this:\n\n## Learn JavaScript on Mimo\n[CAREER PATHFull-Stack Developer Become a full-stack developer. Learn HTML, CSS, JavaScript, and React as well as NodeJS, Express, and SQLBeginner friendly](https:\/\/mimo.org\/courses\/full-stack-development)\n\n[COURSEJavaScript Master the language of the web. Learn variables, functions, objects, and modern ES6+ featuresBeginner friendly](https:\/\/mimo.org\/courses\/learn-javascript)\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction greetUser() {\n  console.log(\"Hello!\");\n}\n```\n\nThe function name here is `greetUser`. It follows the camel case naming convention: lowercase first word, uppercase first letter of each subsequent word.\n\nYou can then call the function using its name, followed by parentheses:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\ngreetUser(); \/\/ Output: Hello!\n```\n\nFunction names are case-sensitive and must begin with a letter, underscore `_`, or dollar sign `$`. Digits are allowed, but not at the beginning.\n\n## When to Use a Function Name in JavaScript\nFunction names in JavaScript are important for organizing and reusing code. Use them when:\n\n### 1\\. Repeating Logic\nIf you need to perform the same task multiple times, wrap it in a function and name it.\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction calculateTotal(price, tax) {\n  return price + price * tax;\n}\n```\n\nYou can now reuse this logic whenever needed.\n\n### 2\\. Making Code More Readable\nDescriptive names help you understand what a [block of code](https:\/\/mimo.org\/glossary\/javascript\/code-block) is doing at a glance.\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction fetchUserData() {\n  \/\/ ...\n}\n```\n\nCompare this to using anonymous or poorly named functions, it’s much harder to understand quickly.\n\n### 3\\. Structuring Larger Applications\nNamed functions make it easier to break complex logic into smaller, understandable pieces. You might have a file with several related functions:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction validateEmail(email) { ... }\nfunction registerUser(user) { ... }\nfunction showWelcomeMessage() { ... }\n```\n\nEach of these is easy to identify and manage.\n\n## Examples of Function Names in JavaScript\n### Example 1: Greeting a User\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction greetUser(name) {\n  console.log(`Hello, ${name}!`);\n}\n\ngreetUser(\"Lee\"); \/\/ Output: Hello, Lee!\n```\n\nThis is a simple, reusable pattern for personal greetings.\n\n### Example 2: Logging a Timestamp\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction logCurrentTime() {\n  const now = new Date();\n  console.log(\"Current time:\", now.toLocaleTimeString());\n}\n\nlogCurrentTime();\n```\n\nClear naming helps describe exactly what this function does.\n\n### Example 3: Math Utility\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction square(num) {\n  return num * num;\n}\n\nconsole.log(square(4)); \/\/ Output: 16\n```\n\nShort, accurate function names like `square` make utility functions easy to use and understand.\n\n## Learn More About JavaScript Function Names\n### JavaScript Function Name Best Practices\nFollowing consistent naming conventions makes your code easier to read and maintain. Most developers use camel case for function names:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction getUserData() { ... }\nfunction sendEmailNotification() { ... }\n```\n\nAvoid abbreviations that make code harder to understand:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction gU() { ... } \/\/ Not clear\n```\n\nChoose names that describe what the function does.\n\n### Reserved Words and Naming Restrictions\nYou can't use JavaScript reserved words like `function`, `return`, or `class` as function names.\n\nThese are invalid:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction return() { ... } \/\/ ❌ Syntax error\n```\n\nFunction names also can’t begin with numbers:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction 123start() { ... } \/\/ ❌ Invalid\n```\n\nBut these are valid:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction _initApp() { ... }\nfunction $fetchData() { ... }\n```\n### Function Expression Naming\nNot all functions require a name. JavaScript allows anonymous functions:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nconst logHello = function() {\n  console.log(\"Hello\");\n};\n```\n\nHere, `logHello` is a variable name, not the function name itself. But you can still give the function an internal name:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nconst logHello = function logMessage() {\n  console.log(\"Hello\");\n};\n```\n\nThis can help with debugging stack traces, although it’s not common unless you're writing more advanced JavaScript.\n\n### Arrow Functions and Naming\nArrow functions are anonymous by default. When you assign one to a variable, the name of the function is derived from the variable name:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nconst sayHi = () => {\n  console.log(\"Hi!\");\n};\n```\n\nHere, `sayHi` becomes the function name implicitly.\n\n### The `name` Property of a Function\nEvery function in JavaScript has a `name` property:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nfunction greetUser() {}\nconsole.log(greetUser.name); \/\/ Output: greetUser\n\nconst showDate = () => {};\nconsole.log(showDate.name); \/\/ Output: showDate\n```\n\nThis can be useful for logging or debugging.\n\n### Naming Async Functions\nIf your function performs asynchronous work, include `async` in the function name when possible to make it obvious:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nasync function fetchUserProfile() {\n  const response = await fetch(\"\/profile\");\n  return response.json();\n}\n```\n\nThis isn’t required, but naming conventions like this can help prevent confusion later.\n\n### Functions Inside Objects\nFunction names can also appear as part of object methods:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nconst user = {\n  sayHello: function() {\n    console.log(\"Hello!\");\n  }\n};\n```\n\nIn ES6 shorthand:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nconst user = {\n  sayHello() {\n    console.log(\"Hello!\");\n  }\n};\n```\n\nIn both cases, `sayHello` is the function name in JavaScript.\n\n### Functions in Classes\nInside a class, function names become methods:\n\nJSX\n\n[Open in Mimo](https:\/\/app.adjust.com\/1bbdlllf)\n\n[Open in Mimo](https:\/\/mimo.org\/web\/register)\n\nCopy Code\n```\nclass User {\n  greet() {\n    console.log(\"Hi!\");\n  }\n}\n```\n\nHere, `greet` is the function name inside the class context.\n\nJoin 35M+ people learning for free on Mimo\n\n![Person 1](https:\/\/mimo.org\/_next\/image?url=%2F_next%2Fstatic%2Fmedia%2Fperson1.2933cb17.png&w=64&q=75&dpl=dpl_H7MiJTQ9ZaEc2BgUdRA75FiCkrXT)\n\n![Person 2](https:\/\/mimo.org\/_next\/image?url=%2F_next%2Fstatic%2Fmedia%2Fperson2.bf69cacc.png&w=64&q=75&dpl=dpl_H7MiJTQ9ZaEc2BgUdRA75FiCkrXT)\n\n![Person 3](https:\/\/mimo.org\/_next\/image?url=%2F_next%2Fstatic%2Fmedia%2Fperson3.c67abacd.png&w=64&q=75&dpl=dpl_H7MiJTQ9ZaEc2BgUdRA75FiCkrXT)\n\n35M+\n\n[CAREER PATHFull-Stack Developer Become a full-stack developer. 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It’s how you reference and call a function later in your program.\n\n## How to Use a Function Name in JavaScript\nThe basic syntax of a named function in [JavaScript](https:\/\/mimo.org\/glossary\/javascript) looks like this:\n\nJSX\n```\nfunction greetUser() {\n  console.log(\"Hello!\");\n}\n```\n\nThe function name here is `greetUser`. It follows the camel case naming convention: lowercase first word, uppercase first letter of each subsequent word.\n\nYou can then call the function using its name, followed by parentheses:\n\nJSX\n```\ngreetUser(); \/\/ Output: Hello!\n```\n\nFunction names are case-sensitive and must begin with a letter, underscore `_`, or dollar sign `$`. Digits are allowed, but not at the beginning.\n\n## When to Use a Function Name in JavaScript\nFunction names in JavaScript are important for organizing and reusing code. Use them when:\n\n### 1\\. Repeating Logic\nIf you need to perform the same task multiple times, wrap it in a function and name it.\n\nJSX\n```\nfunction calculateTotal(price, tax) {\n  return price + price * tax;\n}\n```\n\nYou can now reuse this logic whenever needed.\n\n### 2\\. Making Code More Readable\nDescriptive names help you understand what a [block of code](https:\/\/mimo.org\/glossary\/javascript\/code-block) is doing at a glance.\n\nJSX\n```\nfunction fetchUserData() {\n  \/\/ ...\n}\n```\n\nCompare this to using anonymous or poorly named functions, it’s much harder to understand quickly.\n\n### 3\\. Structuring Larger Applications\nNamed functions make it easier to break complex logic into smaller, understandable pieces. You might have a file with several related functions:\n\nJSX\n```\nfunction validateEmail(email) { ... }\nfunction registerUser(user) { ... }\nfunction showWelcomeMessage() { ... }\n```\n\nEach of these is easy to identify and manage.\n\n## Examples of Function Names in JavaScript\n### Example 1: Greeting a User\nJSX\n```\nfunction greetUser(name) {\n  console.log(`Hello, ${name}!`);\n}\n\ngreetUser(\"Lee\"); \/\/ Output: Hello, Lee!\n```\n\nThis is a simple, reusable pattern for personal greetings.\n\n### Example 2: Logging a Timestamp\nJSX\n```\nfunction logCurrentTime() {\n  const now = new Date();\n  console.log(\"Current time:\", now.toLocaleTimeString());\n}\n\nlogCurrentTime();\n```\n\nClear naming helps describe exactly what this function does.\n\n### Example 3: Math Utility\nJSX\n```\nfunction square(num) {\n  return num * num;\n}\n\nconsole.log(square(4)); \/\/ Output: 16\n```\n\nShort, accurate function names like `square` make utility functions easy to use and understand.\n\n## Learn More About JavaScript Function Names\n### JavaScript Function Name Best Practices\nFollowing consistent naming conventions makes your code easier to read and maintain. Most developers use camel case for function names:\n\nJSX\n```\nfunction getUserData() { ... }\nfunction sendEmailNotification() { ... }\n```\n\nAvoid abbreviations that make code harder to understand:\n\nJSX\n```\nfunction gU() { ... } \/\/ Not clear\n```\n\nChoose names that describe what the function does.\n\n### Reserved Words and Naming Restrictions\nYou can't use JavaScript reserved words like `function`, `return`, or `class` as function names.\n\nThese are invalid:\n\nJSX\n```\nfunction return() { ... } \/\/ ❌ Syntax error\n```\n\nFunction names also can’t begin with numbers:\n\nJSX\n```\nfunction 123start() { ... } \/\/ ❌ Invalid\n```\n\nBut these are valid:\n\nJSX\n```\nfunction _initApp() { ... }\nfunction $fetchData() { ... }\n```\n### Function Expression Naming\nNot all functions require a name. JavaScript allows anonymous functions:\n\nJSX\n```\nconst logHello = function() {\n  console.log(\"Hello\");\n};\n```\n\nHere, `logHello` is a variable name, not the function name itself. But you can still give the function an internal name:\n\nJSX\n```\nconst logHello = function logMessage() {\n  console.log(\"Hello\");\n};\n```\n\nThis can help with debugging stack traces, although it’s not common unless you're writing more advanced JavaScript.\n\n### Arrow Functions and Naming\nArrow functions are anonymous by default. When you assign one to a variable, the name of the function is derived from the variable name:\n\nJSX\n```\nconst sayHi = () => {\n  console.log(\"Hi!\");\n};\n```\n\nHere, `sayHi` becomes the function name implicitly.\n\n### The `name` Property of a Function\nEvery function in JavaScript has a `name` property:\n\nJSX\n```\nfunction greetUser() {}\nconsole.log(greetUser.name); \/\/ Output: greetUser\n\nconst showDate = () => {};\nconsole.log(showDate.name); \/\/ Output: showDate\n```\n\nThis can be useful for logging or debugging.\n\n### Naming Async Functions\nIf your function performs asynchronous work, include `async` in the function name when possible to make it obvious:\n\nJSX\n```\nasync function fetchUserProfile() {\n  const response = await fetch(\"\/profile\");\n  return response.json();\n}\n```\n\nThis isn’t required, but naming conventions like this can help prevent confusion later.\n\n### Functions Inside Objects\nFunction names can also appear as part of object methods:\n\nJSX\n```\nconst user = {\n  sayHello: function() {\n    console.log(\"Hello!\");\n  }\n};\n```\n\nIn ES6 shorthand:\n\nJSX\n```\nconst user = {\n  sayHello() {\n    console.log(\"Hello!\");\n  }\n};\n```\n\nIn both cases, `sayHello` is the function name in JavaScript.\n\n### Functions in Classes\nInside a class, function names become methods:\n\nJSX\n```\nclass User {\n  greet() {\n    console.log(\"Hi!\");\n  }\n}\n```\n\nHere, `greet` is the function name inside the class context.","meta_canonical":null}

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Boilerpipe Text	JavaScript Function Name: Syntax, Usage, and Examples A JavaScript function name identifies a block of reusable code. It’s how you reference and call a function later in your program. How to Use a Function Name in JavaScript The basic syntax of a named function in JavaScript looks like this: JSX function greetUser ( ) { console . log ( "Hello!" ); } The function name here is greetUser . It follows the camel case naming convention: lowercase first word, uppercase first letter of each subsequent word. You can then call the function using its name, followed by parentheses: JSX greetUser (); // Output: Hello! Function names are case-sensitive and must begin with a letter, underscore _ , or dollar sign $ . Digits are allowed, but not at the beginning. When to Use a Function Name in JavaScript Function names in JavaScript are important for organizing and reusing code. Use them when: 1. Repeating Logic If you need to perform the same task multiple times, wrap it in a function and name it. JSX function calculateTotal ( price, tax ) { return price + price * tax; } You can now reuse this logic whenever needed. 2. Making Code More Readable Descriptive names help you understand what a block of code is doing at a glance. JSX function fetchUserData ( ) { // ... } Compare this to using anonymous or poorly named functions, it’s much harder to understand quickly. 3. Structuring Larger Applications Named functions make it easier to break complex logic into smaller, understandable pieces. You might have a file with several related functions: JSX function validateEmail ( email ) { ... } function registerUser ( user ) { ... } function showWelcomeMessage ( ) { ... } Each of these is easy to identify and manage. Examples of Function Names in JavaScript Example 1: Greeting a User JSX function greetUser ( name ) { console . log ( `Hello, ${name} !` ); } greetUser ( "Lee" ); // Output: Hello, Lee! This is a simple, reusable pattern for personal greetings. Example 2: Logging a Timestamp JSX function logCurrentTime ( ) { const now = new Date (); console . log ( "Current time:" , now. toLocaleTimeString ()); } logCurrentTime (); Clear naming helps describe exactly what this function does. Example 3: Math Utility JSX function square ( num ) { return num * num; } console . log ( square ( 4 )); // Output: 16 Short, accurate function names like square make utility functions easy to use and understand. Learn More About JavaScript Function Names JavaScript Function Name Best Practices Following consistent naming conventions makes your code easier to read and maintain. Most developers use camel case for function names: JSX function getUserData ( ) { ... } function sendEmailNotification ( ) { ... } Avoid abbreviations that make code harder to understand: JSX function gU ( ) { ... } // Not clear Choose names that describe what the function does. Reserved Words and Naming Restrictions You can't use JavaScript reserved words like function , return , or class as function names. These are invalid: JSX function return ( ) { ... } // ❌ Syntax error Function names also can’t begin with numbers: JSX function 123start() { ... } // ❌ Invalid But these are valid: JSX function _initApp ( ) { ... } function $fetchData ( ) { ... } Function Expression Naming Not all functions require a name. JavaScript allows anonymous functions: JSX const logHello = function ( ) { console . log ( "Hello" ); }; Here, logHello is a variable name, not the function name itself. But you can still give the function an internal name: JSX const logHello = function logMessage ( ) { console . log ( "Hello" ); }; This can help with debugging stack traces, although it’s not common unless you're writing more advanced JavaScript. Arrow Functions and Naming Arrow functions are anonymous by default. When you assign one to a variable, the name of the function is derived from the variable name: JSX const sayHi = ( ) => { console . log ( "Hi!" ); }; Here, sayHi becomes the function name implicitly. The name Property of a Function Every function in JavaScript has a name property: JSX function greetUser ( ) {} console . log (greetUser. name ); // Output: greetUser const showDate = ( ) => {}; console . log (showDate. name ); // Output: showDate This can be useful for logging or debugging. Naming Async Functions If your function performs asynchronous work, include async in the function name when possible to make it obvious: JSX async function fetchUserProfile ( ) { const response = await fetch ( "/profile" ); return response. json (); } This isn’t required, but naming conventions like this can help prevent confusion later. Functions Inside Objects Function names can also appear as part of object methods: JSX const user = { sayHello : function ( ) { console . log ( "Hello!" ); } }; In ES6 shorthand: JSX const user = { sayHello ( ) { console . log ( "Hello!" ); } }; In both cases, sayHello is the function name in JavaScript. Functions in Classes Inside a class, function names become methods: JSX class User { greet ( ) { console . log ( "Hi!" ); } } Here, greet is the function name inside the class context.
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[What is JavaScript?](https://mimo.org/glossary/javascript) - [Array() find](https://mimo.org/glossary/javascript/array-find) - [\-- operator](https://mimo.org/glossary/javascript/minus-minus-operator) - [\-= operator](https://mimo.org/glossary/javascript/minus-equal-operator) - [\++ operator](https://mimo.org/glossary/javascript/plus-plus-operator) - [\+= operator](https://mimo.org/glossary/javascript/+=-operator) - [Accessing and setting content](https://mimo.org/glossary/javascript/accessing-and-setting-content) - [AND operator](https://mimo.org/glossary/javascript/and-operator) - [Array concat() method](https://mimo.org/glossary/javascript/array-concatenation) - [Array indexOf()](https://mimo.org/glossary/javascript/array-indexof-method) - [Array length](https://mimo.org/glossary/javascript/array-length) - [Array pop()](https://mimo.org/glossary/javascript/array-pop) - [Array shift](https://mimo.org/glossary/javascript/array-shift) - [Array slice() method](https://mimo.org/glossary/javascript/array-slice) - [Arrays](https://mimo.org/glossary/javascript/arrays) - [Arrow function](https://mimo.org/glossary/javascript/arrow-function) - [Async await](https://mimo.org/glossary/javascript/async-await) - [Booleans](https://mimo.org/glossary/javascript/booleans) - [Braces](https://mimo.org/glossary/javascript/braces) - [Callback function](https://mimo.org/glossary/javascript/callback-function) - [Calling the function](https://mimo.org/glossary/javascript/calling-the-function) - [Class](https://mimo.org/glossary/javascript/class) - [Closure](https://mimo.org/glossary/javascript/closure) - [Code block](https://mimo.org/glossary/javascript/code-block) - [Comment](https://mimo.org/glossary/javascript/comment) - [Conditions](https://mimo.org/glossary/javascript/conditions) - [Console](https://mimo.org/glossary/javascript/console) - [const](https://mimo.org/glossary/javascript/const) - [Constructor](https://mimo.org/glossary/javascript/constructor) - [Creating a p element](https://mimo.org/glossary/javascript/creating-a-p-element) - [Data types](https://mimo.org/glossary/javascript/data-types) - [Date getTime()](https://mimo.org/glossary/javascript/date-gettime) - [Destructuring](https://mimo.org/glossary/javascript/destructuring) - [DOM](https://mimo.org/glossary/javascript/dom) - [Else](https://mimo.org/glossary/javascript/else) - [Else if](https://mimo.org/glossary/javascript/else-if) - [Enum](https://mimo.org/glossary/javascript/enum) - [Environment](https://mimo.org/glossary/javascript/environment) - [Equals operator](https://mimo.org/glossary/javascript/equality-operator) - [Error Handling](https://mimo.org/glossary/javascript/error-handling) - [ES6](https://mimo.org/glossary/javascript/es6) - [Event listener method](https://mimo.org/glossary/javascript/event-listener-method) - [Event loop](https://mimo.org/glossary/javascript/event-loop) - [Events](https://mimo.org/glossary/javascript/events) - [Export statement](https://mimo.org/glossary/javascript/export-statement) - [Extends](https://mimo.org/glossary/javascript/extends) - [Fetch API](https://mimo.org/glossary/javascript/fetch-api) - [Filter](https://mimo.org/glossary/javascript/filter) - [For loop](https://mimo.org/glossary/javascript/for-loops) - [forEach()](https://mimo.org/glossary/javascript/foreach) - [Function](https://mimo.org/glossary/javascript/function) - [Function bind()](https://mimo.org/glossary/javascript/function-bind-method) - [Function name](https://mimo.org/glossary/javascript/function-name) - [Greater than](https://mimo.org/glossary/javascript/greater-than) - [Head element](https://mimo.org/glossary/javascript/head-element) - [Hoisting](https://mimo.org/glossary/javascript/hoisting) - [If statement](https://mimo.org/glossary/javascript/if-statement) - [Import statement](https://mimo.org/glossary/javascript/import-statement) - [includes()](https://mimo.org/glossary/javascript/includes-method) - [Infinity property](https://mimo.org/glossary/javascript/infinity-property) - [isNaN function](https://mimo.org/glossary/javascript/isnan-function) - [Iterator](https://mimo.org/glossary/javascript/iterator) - [JSON](https://mimo.org/glossary/javascript/json) - [Less than](https://mimo.org/glossary/javascript/less-than) - [Let](https://mimo.org/glossary/javascript/let) - [Local storage](https://mimo.org/glossary/javascript/local-storage) - [Map](https://mimo.org/glossary/javascript/map) - [Methods](https://mimo.org/glossary/javascript/methods) - [Module](https://mimo.org/glossary/javascript/module) - [Modulo operator](https://mimo.org/glossary/javascript/modulo-operator) - [Node.js](https://mimo.org/glossary/javascript/nodejs) - [null](https://mimo.org/glossary/javascript/null) - [Numbers](https://mimo.org/glossary/javascript/numbers) - [Object](https://mimo.org/glossary/javascript/object) - [Object.keys()](https://mimo.org/glossary/javascript/object-keys-method) - [Optional chaining](https://mimo.org/glossary/javascript/optional-chaining) - [Overriding methods](https://mimo.org/glossary/javascript/overriding-methods) - [Parameters](https://mimo.org/glossary/javascript/parameters) - [Promises](https://mimo.org/glossary/javascript/promises) - [Prototype](https://mimo.org/glossary/javascript/prototype) - [Random](https://mimo.org/glossary/javascript/random) - [Reduce](https://mimo.org/glossary/javascript/reduce) - [Regex](https://mimo.org/glossary/javascript/regex) - [Regular expressions](https://mimo.org/glossary/javascript/regular-expressions) - [Removing an element](https://mimo.org/glossary/javascript/removing-an-element) - [Replace](https://mimo.org/glossary/javascript/replace) - [Scope](https://mimo.org/glossary/javascript/scope) - [Session storage](https://mimo.org/glossary/javascript/session-storage) - [setInterval](https://mimo.org/glossary/javascript/setinterval) - [setTimeout() method](https://mimo.org/glossary/javascript/settimeout) - [Sleep() function](https://mimo.org/glossary/javascript/sleep-function) - [Sort](https://mimo.org/glossary/javascript/sort) - [Splice](https://mimo.org/glossary/javascript/splice) - [Spread operator](https://mimo.org/glossary/javascript/spread-operator) - [String](https://mimo.org/glossary/javascript/strings) - [String concat()](https://mimo.org/glossary/javascript/string-concatenation) - [String indexOf()](https://mimo.org/glossary/javascript/string-indexof-method) - [String slice() method](https://mimo.org/glossary/javascript/string-slice) - [Substring](https://mimo.org/glossary/javascript/substring) - [Switch statement](https://mimo.org/glossary/javascript/switch-statement) - [Template literals](https://mimo.org/glossary/javascript/template-literals) - [Ternary operator](https://mimo.org/glossary/javascript/ternary-operator) - [throw Statement](https://mimo.org/glossary/javascript/throw-error) - [Title](https://mimo.org/glossary/javascript/title) - [Try catch](https://mimo.org/glossary/javascript/try-catch) - [Type conversion](https://mimo.org/glossary/javascript/type-conversion) - [undefined](https://mimo.org/glossary/javascript/undefined) - [var](https://mimo.org/glossary/javascript/var) - [void Operator](https://mimo.org/glossary/javascript/void-operator) - [While loop](https://mimo.org/glossary/javascript/while-loops) JAVASCRIPT # JavaScript Function Name: Syntax, Usage, and Examples A JavaScript function name identifies a block of reusable code. It’s how you reference and call a function later in your program. ## How to Use a Function Name in JavaScript The basic syntax of a named function in [JavaScript](https://mimo.org/glossary/javascript) looks like this: ## Learn JavaScript on Mimo [CAREER PATHFull-Stack Developer Become a full-stack developer. Learn HTML, CSS, JavaScript, and React as well as NodeJS, Express, and SQLBeginner friendly](https://mimo.org/courses/full-stack-development) [COURSEJavaScript Master the language of the web. Learn variables, functions, objects, and modern ES6+ featuresBeginner friendly](https://mimo.org/courses/learn-javascript) JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function greetUser() { console.log("Hello!"); } ``` The function name here is `greetUser`. It follows the camel case naming convention: lowercase first word, uppercase first letter of each subsequent word. You can then call the function using its name, followed by parentheses: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` greetUser(); // Output: Hello! ``` Function names are case-sensitive and must begin with a letter, underscore `_`, or dollar sign `$`. Digits are allowed, but not at the beginning. ## When to Use a Function Name in JavaScript Function names in JavaScript are important for organizing and reusing code. Use them when: ### 1\. Repeating Logic If you need to perform the same task multiple times, wrap it in a function and name it. JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function calculateTotal(price, tax) { return price + price * tax; } ``` You can now reuse this logic whenever needed. ### 2\. Making Code More Readable Descriptive names help you understand what a [block of code](https://mimo.org/glossary/javascript/code-block) is doing at a glance. JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function fetchUserData() { // ... } ``` Compare this to using anonymous or poorly named functions, it’s much harder to understand quickly. ### 3\. Structuring Larger Applications Named functions make it easier to break complex logic into smaller, understandable pieces. You might have a file with several related functions: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function validateEmail(email) { ... } function registerUser(user) { ... } function showWelcomeMessage() { ... } ``` Each of these is easy to identify and manage. ## Examples of Function Names in JavaScript ### Example 1: Greeting a User JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function greetUser(name) { console.log(`Hello, ${name}!`); } greetUser("Lee"); // Output: Hello, Lee! ``` This is a simple, reusable pattern for personal greetings. ### Example 2: Logging a Timestamp JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function logCurrentTime() { const now = new Date(); console.log("Current time:", now.toLocaleTimeString()); } logCurrentTime(); ``` Clear naming helps describe exactly what this function does. ### Example 3: Math Utility JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function square(num) { return num * num; } console.log(square(4)); // Output: 16 ``` Short, accurate function names like `square` make utility functions easy to use and understand. ## Learn More About JavaScript Function Names ### JavaScript Function Name Best Practices Following consistent naming conventions makes your code easier to read and maintain. Most developers use camel case for function names: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function getUserData() { ... } function sendEmailNotification() { ... } ``` Avoid abbreviations that make code harder to understand: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function gU() { ... } // Not clear ``` Choose names that describe what the function does. ### Reserved Words and Naming Restrictions You can't use JavaScript reserved words like `function`, `return`, or `class` as function names. These are invalid: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function return() { ... } // ❌ Syntax error ``` Function names also can’t begin with numbers: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function 123start() { ... } // ❌ Invalid ``` But these are valid: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function _initApp() { ... } function $fetchData() { ... } ``` ### Function Expression Naming Not all functions require a name. JavaScript allows anonymous functions: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` const logHello = function() { console.log("Hello"); }; ``` Here, `logHello` is a variable name, not the function name itself. But you can still give the function an internal name: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` const logHello = function logMessage() { console.log("Hello"); }; ``` This can help with debugging stack traces, although it’s not common unless you're writing more advanced JavaScript. ### Arrow Functions and Naming Arrow functions are anonymous by default. When you assign one to a variable, the name of the function is derived from the variable name: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` const sayHi = () => { console.log("Hi!"); }; ``` Here, `sayHi` becomes the function name implicitly. ### The `name` Property of a Function Every function in JavaScript has a `name` property: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` function greetUser() {} console.log(greetUser.name); // Output: greetUser const showDate = () => {}; console.log(showDate.name); // Output: showDate ``` This can be useful for logging or debugging. ### Naming Async Functions If your function performs asynchronous work, include `async` in the function name when possible to make it obvious: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` async function fetchUserProfile() { const response = await fetch("/profile"); return response.json(); } ``` This isn’t required, but naming conventions like this can help prevent confusion later. ### Functions Inside Objects Function names can also appear as part of object methods: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` const user = { sayHello: function() { console.log("Hello!"); } }; ``` In ES6 shorthand: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` const user = { sayHello() { console.log("Hello!"); } }; ``` In both cases, `sayHello` is the function name in JavaScript. ### Functions in Classes Inside a class, function names become methods: JSX [Open in Mimo](https://app.adjust.com/1bbdlllf) [Open in Mimo](https://mimo.org/web/register) Copy Code ``` class User { greet() { console.log("Hi!"); } } ``` Here, `greet` is the function name inside the class context. Join 35M+ people learning for free on Mimo ![Person 1](https://mimo.org/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Fperson1.2933cb17.png&w=64&q=75&dpl=dpl_H7MiJTQ9ZaEc2BgUdRA75FiCkrXT) ![Person 2](https://mimo.org/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Fperson2.bf69cacc.png&w=64&q=75&dpl=dpl_H7MiJTQ9ZaEc2BgUdRA75FiCkrXT) ![Person 3](https://mimo.org/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Fperson3.c67abacd.png&w=64&q=75&dpl=dpl_H7MiJTQ9ZaEc2BgUdRA75FiCkrXT) 35M+ [CAREER PATHFull-Stack Developer Become a full-stack developer. Learn HTML, CSS, JavaScript, and React as well as NodeJS, Express, and SQLBeginner friendly](https://mimo.org/courses/full-stack-development) [COURSEJavaScript Master the language of the web. Learn variables, functions, objects, and modern ES6+ featuresBeginner friendly](https://mimo.org/courses/learn-javascript) 4\.8 out of 5 across 1M+ reviews Check us out on Apple [AppStore](https://itunes.apple.com/us/app/mimo-learn-how-to-code-through/id1133960732?mt=8&at=1000lpyT), [Google Play Store](https://play.google.com/store/apps/details?id=com.getmimo), and [Trustpilot](https://www.trustpilot.com/review/mimo.org) All Terms & Concepts - [What is JavaScript?](https://mimo.org/glossary/javascript) - [Array() find](https://mimo.org/glossary/javascript/array-find) - [\-- operator](https://mimo.org/glossary/javascript/minus-minus-operator) - [\-= operator](https://mimo.org/glossary/javascript/minus-equal-operator) - [\++ operator](https://mimo.org/glossary/javascript/plus-plus-operator) - [\+= operator](https://mimo.org/glossary/javascript/+=-operator) - [Accessing and setting content](https://mimo.org/glossary/javascript/accessing-and-setting-content) - [AND operator](https://mimo.org/glossary/javascript/and-operator) - [Array concat() method](https://mimo.org/glossary/javascript/array-concatenation) - [Array indexOf()](https://mimo.org/glossary/javascript/array-indexof-method) - [Array length](https://mimo.org/glossary/javascript/array-length) - [Array pop()](https://mimo.org/glossary/javascript/array-pop) - [Array shift](https://mimo.org/glossary/javascript/array-shift) - [Array slice() method](https://mimo.org/glossary/javascript/array-slice) - [Arrays](https://mimo.org/glossary/javascript/arrays) - [Arrow function](https://mimo.org/glossary/javascript/arrow-function) - [Async await](https://mimo.org/glossary/javascript/async-await) - [Booleans](https://mimo.org/glossary/javascript/booleans) - [Braces](https://mimo.org/glossary/javascript/braces) - [Callback function](https://mimo.org/glossary/javascript/callback-function) - [Calling the function](https://mimo.org/glossary/javascript/calling-the-function) - [Class](https://mimo.org/glossary/javascript/class) - [Closure](https://mimo.org/glossary/javascript/closure) - [Code block](https://mimo.org/glossary/javascript/code-block) - [Comment](https://mimo.org/glossary/javascript/comment) - [Conditions](https://mimo.org/glossary/javascript/conditions) - [Console](https://mimo.org/glossary/javascript/console) - [const](https://mimo.org/glossary/javascript/const) - [Constructor](https://mimo.org/glossary/javascript/constructor) - [Creating a p element](https://mimo.org/glossary/javascript/creating-a-p-element) - [Data types](https://mimo.org/glossary/javascript/data-types) - [Date getTime()](https://mimo.org/glossary/javascript/date-gettime) - [Destructuring](https://mimo.org/glossary/javascript/destructuring) - [DOM](https://mimo.org/glossary/javascript/dom) - [Else](https://mimo.org/glossary/javascript/else) - [Else if](https://mimo.org/glossary/javascript/else-if) - [Enum](https://mimo.org/glossary/javascript/enum) - [Environment](https://mimo.org/glossary/javascript/environment) - [Equals operator](https://mimo.org/glossary/javascript/equality-operator) - [Error Handling](https://mimo.org/glossary/javascript/error-handling) - [ES6](https://mimo.org/glossary/javascript/es6) - [Event listener method](https://mimo.org/glossary/javascript/event-listener-method) - [Event loop](https://mimo.org/glossary/javascript/event-loop) - [Events](https://mimo.org/glossary/javascript/events) - [Export statement](https://mimo.org/glossary/javascript/export-statement) - [Extends](https://mimo.org/glossary/javascript/extends) - [Fetch API](https://mimo.org/glossary/javascript/fetch-api) - [Filter](https://mimo.org/glossary/javascript/filter) - [For loop](https://mimo.org/glossary/javascript/for-loops) - [forEach()](https://mimo.org/glossary/javascript/foreach) - [Function](https://mimo.org/glossary/javascript/function) - [Function bind()](https://mimo.org/glossary/javascript/function-bind-method) - [Function name](https://mimo.org/glossary/javascript/function-name) - [Greater than](https://mimo.org/glossary/javascript/greater-than) - [Head element](https://mimo.org/glossary/javascript/head-element) - [Hoisting](https://mimo.org/glossary/javascript/hoisting) - [If statement](https://mimo.org/glossary/javascript/if-statement) - [Import statement](https://mimo.org/glossary/javascript/import-statement) - [includes()](https://mimo.org/glossary/javascript/includes-method) - [Infinity property](https://mimo.org/glossary/javascript/infinity-property) - [isNaN function](https://mimo.org/glossary/javascript/isnan-function) - [Iterator](https://mimo.org/glossary/javascript/iterator) - [JSON](https://mimo.org/glossary/javascript/json) - [Less than](https://mimo.org/glossary/javascript/less-than) - [Let](https://mimo.org/glossary/javascript/let) - [Local storage](https://mimo.org/glossary/javascript/local-storage) - [Map](https://mimo.org/glossary/javascript/map) - [Methods](https://mimo.org/glossary/javascript/methods) - [Module](https://mimo.org/glossary/javascript/module) - [Modulo operator](https://mimo.org/glossary/javascript/modulo-operator) - [Node.js](https://mimo.org/glossary/javascript/nodejs) - [null](https://mimo.org/glossary/javascript/null) - [Numbers](https://mimo.org/glossary/javascript/numbers) - [Object](https://mimo.org/glossary/javascript/object) - [Object.keys()](https://mimo.org/glossary/javascript/object-keys-method) - [Optional chaining](https://mimo.org/glossary/javascript/optional-chaining) - [Overriding methods](https://mimo.org/glossary/javascript/overriding-methods) - [Parameters](https://mimo.org/glossary/javascript/parameters) - [Promises](https://mimo.org/glossary/javascript/promises) - [Prototype](https://mimo.org/glossary/javascript/prototype) - [Random](https://mimo.org/glossary/javascript/random) - [Reduce](https://mimo.org/glossary/javascript/reduce) - [Regex](https://mimo.org/glossary/javascript/regex) - [Regular expressions](https://mimo.org/glossary/javascript/regular-expressions) - [Removing an element](https://mimo.org/glossary/javascript/removing-an-element) - [Replace](https://mimo.org/glossary/javascript/replace) - [Scope](https://mimo.org/glossary/javascript/scope) - [Session storage](https://mimo.org/glossary/javascript/session-storage) - [setInterval](https://mimo.org/glossary/javascript/setinterval) - [setTimeout() method](https://mimo.org/glossary/javascript/settimeout) - [Sleep() function](https://mimo.org/glossary/javascript/sleep-function) - [Sort](https://mimo.org/glossary/javascript/sort) - [Splice](https://mimo.org/glossary/javascript/splice) - [Spread operator](https://mimo.org/glossary/javascript/spread-operator) - [String](https://mimo.org/glossary/javascript/strings) - [String concat()](https://mimo.org/glossary/javascript/string-concatenation) - [String indexOf()](https://mimo.org/glossary/javascript/string-indexof-method) - [String slice() method](https://mimo.org/glossary/javascript/string-slice) - [Substring](https://mimo.org/glossary/javascript/substring) - [Switch statement](https://mimo.org/glossary/javascript/switch-statement) - [Template literals](https://mimo.org/glossary/javascript/template-literals) - [Ternary operator](https://mimo.org/glossary/javascript/ternary-operator) - 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Readable Markdown	## JavaScript Function Name: Syntax, Usage, and Examples A JavaScript function name identifies a block of reusable code. It’s how you reference and call a function later in your program. ## How to Use a Function Name in JavaScript The basic syntax of a named function in [JavaScript](https://mimo.org/glossary/javascript) looks like this: JSX ``` function greetUser() { console.log("Hello!"); } ``` The function name here is `greetUser`. It follows the camel case naming convention: lowercase first word, uppercase first letter of each subsequent word. You can then call the function using its name, followed by parentheses: JSX ``` greetUser(); // Output: Hello! ``` Function names are case-sensitive and must begin with a letter, underscore `_`, or dollar sign `$`. Digits are allowed, but not at the beginning. ## When to Use a Function Name in JavaScript Function names in JavaScript are important for organizing and reusing code. Use them when: ### 1\. Repeating Logic If you need to perform the same task multiple times, wrap it in a function and name it. JSX ``` function calculateTotal(price, tax) { return price + price * tax; } ``` You can now reuse this logic whenever needed. ### 2\. Making Code More Readable Descriptive names help you understand what a [block of code](https://mimo.org/glossary/javascript/code-block) is doing at a glance. JSX ``` function fetchUserData() { // ... } ``` Compare this to using anonymous or poorly named functions, it’s much harder to understand quickly. ### 3\. Structuring Larger Applications Named functions make it easier to break complex logic into smaller, understandable pieces. You might have a file with several related functions: JSX ``` function validateEmail(email) { ... } function registerUser(user) { ... } function showWelcomeMessage() { ... } ``` Each of these is easy to identify and manage. ## Examples of Function Names in JavaScript ### Example 1: Greeting a User JSX ``` function greetUser(name) { console.log(`Hello, ${name}!`); } greetUser("Lee"); // Output: Hello, Lee! ``` This is a simple, reusable pattern for personal greetings. ### Example 2: Logging a Timestamp JSX ``` function logCurrentTime() { const now = new Date(); console.log("Current time:", now.toLocaleTimeString()); } logCurrentTime(); ``` Clear naming helps describe exactly what this function does. ### Example 3: Math Utility JSX ``` function square(num) { return num * num; } console.log(square(4)); // Output: 16 ``` Short, accurate function names like `square` make utility functions easy to use and understand. ## Learn More About JavaScript Function Names ### JavaScript Function Name Best Practices Following consistent naming conventions makes your code easier to read and maintain. Most developers use camel case for function names: JSX ``` function getUserData() { ... } function sendEmailNotification() { ... } ``` Avoid abbreviations that make code harder to understand: JSX ``` function gU() { ... } // Not clear ``` Choose names that describe what the function does. ### Reserved Words and Naming Restrictions You can't use JavaScript reserved words like `function`, `return`, or `class` as function names. These are invalid: JSX ``` function return() { ... } // ❌ Syntax error ``` Function names also can’t begin with numbers: JSX ``` function 123start() { ... } // ❌ Invalid ``` But these are valid: JSX ``` function _initApp() { ... } function $fetchData() { ... } ``` ### Function Expression Naming Not all functions require a name. JavaScript allows anonymous functions: JSX ``` const logHello = function() { console.log("Hello"); }; ``` Here, `logHello` is a variable name, not the function name itself. But you can still give the function an internal name: JSX ``` const logHello = function logMessage() { console.log("Hello"); }; ``` This can help with debugging stack traces, although it’s not common unless you're writing more advanced JavaScript. ### Arrow Functions and Naming Arrow functions are anonymous by default. When you assign one to a variable, the name of the function is derived from the variable name: JSX ``` const sayHi = () => { console.log("Hi!"); }; ``` Here, `sayHi` becomes the function name implicitly. ### The `name` Property of a Function Every function in JavaScript has a `name` property: JSX ``` function greetUser() {} console.log(greetUser.name); // Output: greetUser const showDate = () => {}; console.log(showDate.name); // Output: showDate ``` This can be useful for logging or debugging. ### Naming Async Functions If your function performs asynchronous work, include `async` in the function name when possible to make it obvious: JSX ``` async function fetchUserProfile() { const response = await fetch("/profile"); return response.json(); } ``` This isn’t required, but naming conventions like this can help prevent confusion later. ### Functions Inside Objects Function names can also appear as part of object methods: JSX ``` const user = { sayHello: function() { console.log("Hello!"); } }; ``` In ES6 shorthand: JSX ``` const user = { sayHello() { console.log("Hello!"); } }; ``` In both cases, `sayHello` is the function name in JavaScript. ### Functions in Classes Inside a class, function names become methods: JSX ``` class User { greet() { console.log("Hi!"); } } ``` Here, `greet` is the function name inside the class context.
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