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Property Summary
constructor
Specifies the function that creates an object's prototype.
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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.
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Property Details
Specifies the function that creates an object's prototype.
Returns
Function
Sample
function Tree(name) { this.name = name; } theTree = new Tree("Redwood"); application.output("theTree.constructor is " + theTree.constructor);
Specifies the number of arguments expected by the function.
Returns
Number
Sample
function addNumbers(x, y){ if (addNumbers.length == 2) { return (x + y); } else return 0; }
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Method Details
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");
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
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
()
Returns a string representing the source code of the function. Overrides the Object.toString method.
Returns
String
Sample
function printHello() { return "Hello"; } application.output(printHello.toString());