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Property Summary
Function constructor
Specifies the function that creates an object's prototype.
Number length
Specifies the number of arguments expected by the function.



Method Summary
void apply()
Applies the method of another object in the context of a different object (the calling object); arguments can be passed as an Array object.
void bind()
Creates a new function which, when called, itself calls this function in the context of the provided value, with a given sequence of arguments preceding any provided when the new function was called.
void call()
Calls (executes) a method of another object in the context of a different object (the calling object); arguments can be passed as they are.
String toString()
Returns a string representing the source code of the function.



Property Details

constructor

Specifies the function that creates an object's prototype.

Returns

Sample

function Tree(name) {
	this.name = name;
}
theTree = new Tree("Redwood");
console.log("theTree.constructor is " + theTree.constructor);
 

length

Specifies the number of arguments expected by the function.

Returns

Sample

function addNumbers(x, y){
	if (addNumbers.length == 2) {
		return (x + y);
	} else
		return 0;
}
 



Method Details

apply

void apply ()
Applies the method of another object in the context of a different object (the calling object); arguments can be passed as an Array object.

Returns

void

Sample

function book(name, author) {
	this.name = name;
	this.author = author;
}

function book_with_topic(name, author, topic) {
	this.topic = topic;
	book.apply(this, arguments);
}
book_with_topic.prototype = new book();

var aBook = new book_with_topic("name","author","topic");
 

bind

void bind ()
Creates a new function which, when called, itself calls this function in the context of the provided value, with a given sequence of arguments preceding any provided when the new function was called.

Returns

void

Sample

var x = 9,
	module = {
		getX: function() {
		     return this.x;
		},
		x: 81
	};
//  "module.getX()" called, "module" is "this", "module.x" is returned
module.getX(); // > 81
//  "getX()" called, "this" is global, "x" is returned
getX(); // > 9
//  store a reference with "module" bound as "this"
var boundGetX = getX.bind(module);
//  "boundGetX()" called, "module" is "this" again, "module.x" is returned
boundGetX(); // > 81
 

call

void call ()
Calls (executes) a method of another object in the context of a different object (the calling object); arguments can be passed as they are.

Returns

void

Sample

function book(name) {
	this.name = name;
}

function book_with_author(name, author) {
	this.author = author;
	book.call(this, name);
}
book_with_author.prototype = new book();

var aBook = new book_with_author("name","author");
 

toString

String toString ()
Returns a string representing the source code of the function. Overrides the Object.toString method.

Returns

Sample

function printHello() {
	return "Hello";
}
application.output(printHello.toString());
 



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