3 ways to define a JavaScript class

Introduction JavaScript is a very flexible object-oriented language when it comes to syntax. In this article you can find three ways of defining and instantiating an object. It's important to note that there are no classes in JavaScript. 1. This is probably one of the most common ways. function Apple (type) { this.type = type; this.color = "red"; this.getInfo = getAppleInfo; } function getAppleInfo() { return this.color + ' ' + this.type + ' apple'; } To instantiate an object using the Apple constructor function, set some properties and call methods you can do the following: var apple = new Apple('macintosh'); apple.color = "reddish"; alert(apple.getInfo()); 1.1. In the example above you see that the method getInfo() of the Apple "class" was defined in a separate function getAppleInfo(). function Apple (type) { this.type = type; this.color = "red"; this.getInfo = function() { return this.color + ' ' + this.type + ' apple'; }; } 1.2. 2. apple.color = "reddish"; alert(apple.getInfo()); 3.

css Zen Garden: The Beauty in CSS Design Inversion of Control Containers and the Dependency Injection pattern In the Java community there's been a rush of lightweight containers that help to assemble components from different projects into a cohesive application. Underlying these containers is a common pattern to how they perform the wiring, a concept they refer under the very generic name of "Inversion of Control". In this article I dig into how this pattern works, under the more specific name of "Dependency Injection", and contrast it with the Service Locator alternative. The choice between them is less important than the principle of separating configuration from use. One of the entertaining things about the enterprise Java world is the huge amount of activity in building alternatives to the mainstream J2EE technologies, much of it happening in open source. Underlying these containers are a number of interesting design principles, things that go beyond both these specific containers and indeed the Java platform. Components and Services A Naive Example class MovieLister... Inversion of Control

Learning Javascript with Object Graphs HEADS UP! This article was written for an older version of node. More up-to-date information may be available elsewhere. One of the secrets to being a super effective JavaScript developer is to truly understand the semantics of the language. This article will explain the basic elemental parts of JavaScript using easy to follow diagrams. References Everywhere A variable in JavaScript is simply a label that references a value in memory somewhere. Local Variables In the following example, we will create four local variables in the top-level scope and point them to some primitive values: variables.js // Let's create some local variables in the top scopevar name = "Tim Caswell";var age = 28;var isProgrammer = true;var likesJavaScript = true;// Test to see if the two variables reference the same valueisProgrammer === likesJavaScript; Notice that the two boolean variables point to the same value in memory. The outer box represents the outermost closure scope. Objects and Prototype Chains objects.js

Inversion of Control Containers and the Dependency Injection pattern In the Java community there's been a rush of lightweight containers that help to assemble components from different projects into a cohesive application. Underlying these containers is a common pattern to how they perform the wiring, a concept they refer under the very generic name of "Inversion of Control". In this article I dig into how this pattern works, under the more specific name of "Dependency Injection", and contrast it with the Service Locator alternative. The choice between them is less important than the principle of separating configuration from use. One of the entertaining things about the enterprise Java world is the huge amount of activity in building alternatives to the mainstream J2EE technologies, much of it happening in open source. A lot of this is a reaction to the heavyweight complexity in the mainstream J2EE world, but much of it is also exploring alternatives and coming up with creative ideas. Components and Services A Naive Example class MovieLister...

Raphaël—JavaScript Library JSPatterns.com Introduction to general web development — Hall of Bright Carvings You see the same questions being bandied about in every developer forum you vist. I figured it might be a decent idea to try and get a collection of answers to the more common queries in one place and combine it with a general introduction to web development. If you’re just starting out in Web Development the first place you should be looking is the Opera Web Standards Curriculum at Read every link they provide. If you don’t understand something they are talking about then go and research the topic until you do understand what they’re talking about. I’ll say this again so there’s no misunderstanding: These are the baseline by which developers should be measuring their knowledge. If you do not understand the principles and ideas presented in the Opera Web Standards Curriculum then you are at a serious disadvantage in the world of web development and you should make the appropriate decisions regarding that deficiency. Starting a new project

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