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Proxy.proxy.apply

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

Syntax

const 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

Trapping a function call

The following code traps a function call.

const 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

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
apply 49 12 18 No 36 10
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
apply 49 49 18 36 10 5.0
Server
Node.js
apply 6.0.0

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy/apply