The handler.apply() method is a trap for a function call.

Syntax

var p = new Proxy(target, {
  apply: function(target, thisArg, argumentsList) {
  }
});

Parameters

The following parameters are passed to the apply method. this is bound to the handler.

target
The target object.
thisArg
The this argument for the call.
argumentsList
The list of arguments for the call.

Return value

The apply method can return any value.

Description

The handler.apply method is a trap for a function call.

Interceptions

This trap can intercept these operations:

Invariants

If the following invariants are violated, the proxy will throw a TypeError:

The target must be a callable itself. That is, it must be a function object.

Examples

The following code traps a function call.

var p = new Proxy(function() {}, {
  apply: function(target, thisArg, argumentsList) {
    console.log('called: ' + argumentsList.join(', '));
    return argumentsList[0] + argumentsList[1] + argumentsList[2];
  }
});

console.log(p(1, 2, 3)); // "called: 1, 2, 3"
                         // 6

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of '[[Call]]' in that specification.
Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of '[[Call]]' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support 49Edge Full support 12Firefox Full support 18IE No support NoOpera Full support 36Safari Full support 10WebView Android Full support 49Chrome Android Full support 49Edge Mobile Full support YesFirefox Android Full support 18Opera Android Full support 36Safari iOS Full support 10Samsung Internet Android Full support 5.0nodejs Full support 6.0.0

Legend

Full support  
Full support
No support  
No support

See also

Document Tags and Contributors

Contributors to this page: wbamberg, mottykohn, tclancy13, fscholz, nmve, kdex, mikaelbr, arai
Last updated by: wbamberg,