* Skip to main content 
  * Skip to search 
  * Skip to select language 

[ MDN Web Docs  ](/en-US/) Open main menu

  * References  [ References ](/en-US/docs/Web)
    * [ Overview / Web Technology  Web technology reference for developers  ](/en-US/docs/Web)
    * [ HTML  Structure of content on the web  ](/en-US/docs/Web/HTML)
    * [ CSS  Code used to describe document style  ](/en-US/docs/Web/CSS)
    * [ JavaScript  General-purpose scripting language  ](/en-US/docs/Web/JavaScript)
    * [ HTTP  Protocol for transmitting web resources  ](/en-US/docs/Web/HTTP)
    * [ Web APIs  Interfaces for building web applications  ](/en-US/docs/Web/API)
    * [ Web Extensions  Developing extensions for web browsers  ](/en-US/docs/Mozilla/Add-ons/WebExtensions)
    * [ Web Technology  Web technology reference for developers  ](/en-US/docs/Web)
  * Guides  [ Guides ](/en-US/docs/Learn)
    * [ Overview / MDN Learning Area  Learn web development  ](/en-US/docs/Learn)
    * [ MDN Learning Area  Learn web development  ](/en-US/docs/Learn)
    * [ HTML  Learn to structure web content with HTML  ](/en-US/docs/Learn/HTML)
    * [ CSS  Learn to style content using CSS  ](/en-US/docs/Learn/CSS)
    * [ JavaScript  Learn to run scripts in the browser  ](/en-US/docs/Learn/JavaScript)
    * [ Accessibility  Learn to make the web accessible to all  ](/en-US/docs/Web/Accessibility)
  * Plus  [ Plus ](/en-US/plus)
    * [ Overview  A customized MDN experience  ](/en-US/plus)
    * [ AI Help (beta)  Get real-time assistance and support  ](/en-US/plus/ai-help)
    * [ Updates  All browser compatibility updates at a glance  ](/en-US/plus/updates)
    * [ Documentation  Learn how to use MDN Plus  ](/en-US/plus/docs/features/overview)
    * [ FAQ  Frequently asked questions about MDN Plus  ](/en-US/plus/docs/faq)
  * [ Curriculum  New  ](/en-US/curriculum/)
  * [ Blog ](/en-US/blog/)
  * [ Play ](/en-US/play)
  * [ AI Help  Beta  ](/en-US/plus/ai-help)

Search MDN  Clear search input  Search

Theme

  * [ Log in ](/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FOperators%2Ffunction)
  * [ Sign up for free  ](/users/fxa/login/authenticate/?next=%2Fen-US%2Fdocs%2FWeb%2FJavaScript%2FReference%2FOperators%2Ffunction)

  1. [ References  ](/en-US/docs/Web)
  2. [ JavaScript  ](/en-US/docs/Web/JavaScript)
  3. [ Reference  ](/en-US/docs/Web/JavaScript/Reference)
  4. [ Expressions and operators  ](/en-US/docs/Web/JavaScript/Reference/Operators)
  5. [ function expression  ](/en-US/docs/Web/JavaScript/Reference/Operators/function)

Article Actions

  * English (US) 

Filter sidebar  Clear filter input

##  In this article

  * Try it 
  * Syntax 
  * Description 
  * Examples 
  * Specifications 
  * Browser compatibility 
  * See also 

  1. [ JavaScript ](/en-US/docs/Web/JavaScript)
  2. [ Tutorials ](/en-US/docs/Web/JavaScript/Tutorials)
  3. Complete beginners 
    1. [ JavaScript basics ](/en-US/docs/Learn/Getting_started_with_the_web/JavaScript_basics)
    2. [ JavaScript first steps ](/en-US/docs/Learn/JavaScript/First_steps)
    3. [ JavaScript building blocks ](/en-US/docs/Learn/JavaScript/Building_blocks)
    4. [ Introducing JavaScript objects ](/en-US/docs/Learn/JavaScript/Objects)
  4. JavaScript Guide 
    1. [ Introduction ](/en-US/docs/Web/JavaScript/Guide/Introduction)
    2. [ Grammar and types ](/en-US/docs/Web/JavaScript/Guide/Grammar_and_types)
    3. [ Control flow and error handling ](/en-US/docs/Web/JavaScript/Guide/Control_flow_and_error_handling)
    4. [ Loops and iteration ](/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration)
    5. [ Functions ](/en-US/docs/Web/JavaScript/Guide/Functions)
    6. [ Expressions and operators ](/en-US/docs/Web/JavaScript/Guide/Expressions_and_operators)
    7. [ Numbers and dates ](/en-US/docs/Web/JavaScript/Guide/Numbers_and_dates)
    8. [ Text formatting ](/en-US/docs/Web/JavaScript/Guide/Text_formatting)
    9. [ Regular expressions ](/en-US/docs/Web/JavaScrip