HasInstance() (Function/internal)

Internal private function to test for the existence of an instance.


ECMAScript edition - 3

This internal function returns a Boolean value indicating whether the function object is the prototype of an instance object that is passed as an argument. If it is, then the function returns true.

This is an internal function very similar to the Object.isPrototypeOf() method.

See also:Object.isPrototypeOf()


ECMA 262 edition 3 - section -