Function

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Property Summary

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Function

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constructor
Specifies the function that creates an object's prototype.

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Number

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length
Specifies the number of arguments expected by the function.

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Method Summary

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void

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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.

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void

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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.

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void

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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.

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String

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toString()
Returns a string representing the source code of the function.

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Property Details

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constructor

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Specifies the function that creates an object's prototype.

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Returns

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Function

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Sample

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

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length

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Specifies the number of arguments expected by the function.

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Returns

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Number

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Sample

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

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Method Details

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apply

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void

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apply

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()

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

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Returns

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void

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Sample

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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");

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bind

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void

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bind

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()

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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.

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Returns

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void

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Sample

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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

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call

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void

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call

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()

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

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Returns

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void

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Sample

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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");

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toString

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String

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toString

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()

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

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Returns

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String

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Sample

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

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Child pages

Function

constructor

length

apply

bind

call

toString