mozilla
Your Search Results

    arguments.length

    The arguments.length property contains the number of arguments passed to the function.

    Syntax

    arguments.length

    Description

    The arguments.length property provides the number of arguments actually passed to a function. This can be more or less than the defined parameter count (see Function.length).

    Examples

    Using arguments.length

    In this example we define a function that can add two or more numbers together.

    function adder(base /*, n2, ... */) {
      base = Number(base);
      for (var i = 1; i < arguments.length; i++) {
        base += Number(arguments[i]);
      }
      return base;
    }
    

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.1
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Arguments Object' in that specification.
    Standard  
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'Arguments Exotic Objects' in that specification.
    Standard  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Last updated by: fscholz,
    Hide Sidebar