The arguments.length
property contains the number of arguments passed to the function.
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's 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; }
Note the difference between Function.length
and arguments.length
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'Arguments Exotic Objects' in that specification. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
length | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 1 | IE Full support 4 | Opera Full support 4 | Safari Full support 1 | WebView Android Full support 1 | Chrome Android Full support 18 | Firefox Android Full support 4 | Opera Android Full support 10.1 | Safari iOS Full support 1 | Samsung Internet Android Full support 1.0 | nodejs Full support Yes |
Legend
- Full support
- Full support