handler.apply()

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

There are no invariants for the handler.apply method.

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 2017 Draft (ECMA-262)
The definition of '[[Call]]' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? 18 (18) ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? 18.0 (18) ? ? ?

See also

Document Tags and Contributors

 Contributors to this page: fscholz, mikaelbr, arai
 Last updated by: fscholz,