JavaScript Tutorials - Herong's Tutorial Examples - Version 2.21, by Dr. Herong Yang
Function Object Inherited Properties and Methods
This section provides a tutorial example on how to Function object inherited properties and methods.
Because a function is an object of the Function type, it has some interesting inherited properties and methods:
The tutorial example below shows you how to use the properties and methods inherited in a Function object:
// Function_Properties_and_Methods.js // Copyright (c) 2013 by Dr. Herong Yang, herongyang.com var sign = new Function("name", "this.signature = name;" ) println("Function body: " + sign.toString()); println("# of parameters: " + sign.length); // Executing it on the current object sign("Herong"); println("this.signature: " + this.signature); // Applying it on another object var java = new Object(); sign.apply(java, new Array("Sun")); println("java.signature: " + java.signature); // Calling it on another object var pc = new Object(); sign.call(pc, "IBM"); println("pc.signature: " + pc.signature);
Run this JavaScript file with "jrunscript" in a command window, you will get:
Function body: function anonymous(name) { this.signature = name; } # of parameters: 1 this.signature: Herong java.signature: Sun pc.signature: IBM
Very cool. Everything worked as I expected. One small surprise is that the name of a function object created with the Function constructor is "anonymous".
Table of Contents
ECMAScript Language Specification and JavaScript Dialects
Data Types, Variables and Expressions
Creating, Accessing, and Manipulating Arrays
Defining and Calling Functions
Web Browser Supporting JavaScript
Server-Side and Client-Side Web Scripting
Defining Your Own Object Types
Inheritance of Properties and Methods through the Prototype Object Chain
'jrunscript' - JavaScript Shell Command from JDK
►Using Functions as "Function" Objects
Functions Are Objects of the "Function" Type
Using the Function Constructor
►Function Object Inherited Properties and Methods
Function Object Instance Properties
Creating Function Objects with "function" Statements
Creating Function Objects with the "function" Operator
Comparing 3 Ways of Creating Functions
Introduction to Built-in Object Types