Property Summary | |
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Function | #constructor Specifies the function that creates an object's prototype. |
Number | #length Specifies the number of arguments expected by the function. |
Method Summary | |
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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 |
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constructor |
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); |
length |
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; } |
Method Details |
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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
String |
Sample
function printHello() { return "Hello"; } application.output(printHello.toString()); |