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A re-introduction to JavaScript

A re-introduction to JavaScript
Why a re-introduction? Because JavaScript is notorious for being the world's most misunderstood programming language. It is often derided as being a toy, but beneath its layer of deceptive simplicity, powerful language features await. JavaScript is now used by an incredible number of high-profile applications, showing that deeper knowledge of this technology is an important skill for any web or mobile developer. It's useful to start with an overview of the language's history. Several months later, Microsoft released JScript with Internet Explorer 3. Because it is more familiar, we will refer to ECMAScript as "JavaScript" from this point on. Unlike most programming languages, the JavaScript language has no concept of input or output. Overview JavaScript is a multi-paradigm, dynamic language with types and operators, standard built-in objects, and methods. Let's start off by looking at the building blocks of any language: the types. And there are some built-in Error types as well. Numbers Related:  Javascript

Backbone patterns Building apps with Backbone.js Here, I try to document the good practices that our team has learned along the way building Backbone applications. This document assumes that you already have some knowledge of Backbone.js, jQuery, and of course, JavaScript itself. Table of contents Thanks A List of Foundational JavaScript Tools In our boot camps, students are introduced to several tools and libraries to expand the abilities of their code. Kalina, one of our current JavaScript students, compiled a list of these tools and wanted to share it with other Code Fellows. Ivan Storck, our JavaScript Boot Camp instructor, used Kalina's list to draft up this helpful mind map: General Scaffolding Tools (for starting projects) Yeoman - Yeoman is a robust and opinionated client-side stack, comprising tools and frameworks that can help developers quickly build beautiful web applications. Build Tools (automation) Grunt.js - The Grunt ecosystem is huge and it's growing every day. Package Management Tools Front End MVC Frameworks Backbone.js - Backbone.js gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, and views with declarative event handling. Templates Testing Back End Servers Databases Architectural Style Assertion Libraries Update:

Introduction to Object-Oriented JavaScript Object-oriented to the core, JavaScript features powerful, flexible OOP capabilities. This article starts with an introduction to object-oriented programming, then reviews the JavaScript object model, and finally demonstrates concepts of object-oriented programming in JavaScript. This article does not describe the newer syntax for object-oriented programming in ECMAScript 6. JavaScript review If you don't feel confident about JavaScript concepts such as variables, types, functions, and scope, you can read about those topics in A re-introduction to JavaScript. Object-oriented programming Object-oriented programming (OOP) is a programming paradigm that uses abstraction to create models based on the real world. OOP envisions software as a collection of cooperating objects rather than a collection of functions or simply a list of commands (as is the traditional view). Terminology Namespace A container which lets developers bundle all functionality under a unique, application-specific name. Class

Advanced Web Applications With Object-Oriented JavaScript Recently I interviewed a software developer with five years experience in developing Web applications. She’d been doing JavaScript for four and a half years, she rated her JavaScript skill as very good, and—as I found out soon after—she actually knew very little about JavaScript. I didn’t really blame her for that, though. In a way, that assumption is not entirely groundless. Indeed, until recently, I’d always been able to get by with whatever little JavaScript I knew, armed only with the MSDN® DHTML reference and my C++/C# experience. Object-oriented programming (OOP) is one popular approach that’s used in many JavaScript libraries to make a codebase more manageable and maintainable. JavaScript Objects Are Dictionaries In C++ or C#, when we’re talking about objects, we’re referring to instances of classes or structs. var userObject = new Object(); userObject.lastLoginTime = new Date(); alert(userObject.lastLoginTime); does exactly the same thing as this: OK, so what’s happening here?

Web Design/JavaScript Challenges Are you ready for the Javascript challenges? These challenges aim to build your Javascript skills with practical activities that can be immediately useful for your own websites! Please make sure you are familiar with the window and document objects in Javascript before taking on these challenges (see the activities Getting to know Javascript events and Getting to know the Document Object Model with Javascript.) Challenge 1: Peekaboo Elements[edit] Paste the following code into a new HTML document and view it in your browser. <! The aim of this challenge is to only display the email paragraph when the checkbox is checked, but we'll break that down into smaller tasks! Step 1: Hiding the email fields by default Add some plain old CSS style so that the "emailpara" paragraph isn't displayed when the page first loads (using the CSS 'display' property). Step 2: Adding a function template Add an event so that when the checkbox is clicked your function is called and test that it works! Not bad!

Patterns For Large-Scale JavaScript Application Architecture Today we're going to discuss an effective set of patterns for large-scale JavaScript application architecture. The material is based on my talk of the same name, last presented at LondonJS and inspired by previous work by Nicholas Zakas. Who am I and why am I writing about this topic? I'm currently a JavaScript and UI developer at AOL helping to plan and write the front-end architecture to our next generation of client-facing applications. I also consider myself something of a design pattern enthusiast (although there are far more knowledgeable experts on this topic than I). Can you summarize this article in 140 characters? In the event of you being short for time, here's the tweet-sized summary of this article: Decouple app. architecture w/module,facade & mediator patterns. What exactly is a 'large' JavaScript application? Before we begin, let us attempt to define what we mean when we refer to a JavaScript application as being significantly 'large'. Let's review your current architecture.

msubra/jaadi.js Global Objects This chapter documents all of JavaScript's standard, built-in objects, including their methods and properties. The term "global objects" (or standard built-in objects) here is not to be confused with the global object. Here, global objects refer to objects in the global scope (but only if ECMAScript 5 strict mode is not used; in that case it returns undefined). Other objects in the global scope are either created by the user script or provided by the host application. Standard objects by category Value properties These global properties return a simple value; they have no properties or methods. Function properties These global functions—functions which are called globally rather than on an object—directly return their results to the caller. Fundamental objects These are the fundamental, basic objects upon which all other objects are based. Numbers and dates These are the base objects representing numbers, dates, and mathematical calculations. Text processing Indexed collections Keyed collections

JavaScript: The World's Most Misunderstood Programming Language Douglas Crockford www.crockford.com JavaScript, aka Mocha, aka LiveScript, aka JScript, aka ECMAScript, is one of the world's most popular programming languages. Virtually every personal computer in the world has at least one JavaScript interpreter installed on it and in active use. JavaScript's popularity is due entirely to its role as the scripting language of the WWW. Despite its popularity, few know that JavaScript is a very nice dynamic object-oriented general-purpose programming language. The Name The Java- prefix suggests that JavaScript is somehow related to Java, that it is a subset or less capable version of Java. JavaScript has a syntactic similarity to Java, much as Java has to C. JavaScript was not developed at Sun Microsystems, the home of Java. The -Script suffix suggests that it is not a real programming language, that a scripting language is less than a programming language. Lisp in C's Clothing Typecasting JavaScript was designed to run in Netscape Navigator. Moving Target

Mozilla Firefox Welcoming all the 170 + participants who have been accepted in this course. Everyone who applied and completed both parts of the sign-up task have been accepted. To all the participants who were not accepted, the entire content of this course is being made available online, and you are very welcome to follow along. Please continue reading for course details. Course Philosophy: I am very inspired by the concept of Massive Open Online Courses (MOOC). A teacher is also a student who is further ahead on the road. The facilitators of this course, Ozzie and myself (Parag) are also students of Javascript who are perhaps a few miles ahead on the road. Teaching is the best way of learning something. Course Facilitators: Ozzie, and myself (Parag) are the facilitators of this course. Course Duration and schedule: This course will last for 6 weeks, beginning from 26th January 2011, and ending on 8th March, 2011. Learning Process: Besides this, P2PU has a chat facility which will also be used.

Initializr - Start an HTML5 Boilerplate project in 15 seconds! Callbacks are imperative, promises are functional: Node’s biggest missed opportunity The nature of promises is that they remain immune to changing circumstances.Frank Underwood, ‘House of Cards’ You will often hear it said that JavaScript is a ‘functional’ programming language. It is described as such simply because functions are first-class values: many other features that define functional programming – immutable data, preference for recursion over looping, algebraic type systems, avoidance of side effects – are entirely absent. And while first-class functions are certainly useful, and enable users to program in functional style should they decide to, the notion that JS is functional often overlooks a core aspect of functional programming: programming with values. ‘Functional programming’ is something of a misnomer, in that it leads a lot of people to think of it as meaning ‘programming with functions’, as opposed to programming with objects. At its best, functional programming is declarative. Everybody uses [callbacks]. readFile :: String -> Callback -> () A.

JavaScript Closures 101- they're not magic JavaScript Closures 101- they're not magic Credits: This tutorial is written by Morris Johns. Morris maintains a personal blog called Developing Thoughts where he can be contacted via. This tutorial explains closures so that a regular programmer can understand them - using working JavaScript code. Closures are not hard to understand once the core concept is grokked. This article is intended for programmers with some programming experience in a main-stream language, and who can read the following JavaScript function: An Example of a Closure Two one sentence summaries: a closure is the local variables for a function - kept alive after the function has returned, or a closure is a stack-frame which is not deallocated when the function returns. The following code returns a reference to a function: Most JavaScript programmers will understand how a reference to a function is returned to a variable in the above code.

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