handler.apply()

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

Syntax

new Proxy(target, {
  apply(target, thisArg, argumentsList) {
  }
});

Parameters

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

• target
  • : The target callable 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:

• Function call: proxy(...args)
• Function.prototype.apply() and Function.prototype.call()
• Reflect.apply()

Or any other operation that invokes the [[Call]] internal method.

Invariants

If the following invariants are violated, the trap throws a TypeError when invoked.

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