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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support491218 No3610
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support4949 Yes1836105.0

See also

Document Tags and Contributors

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