A Simple JavaScript Observer

I see a lot of scripts out there where the original author decided they needed an observer and knocked a simple one together. I’m not complaining about this situation, the observer is an extremely useful design pattern and it’s always reassuring to see one – a good observer can allow very simple and loosely-coupled integration […]

Creating a Template Engine Part 2: The Code

Last time we ripped off a bunch of libraries to create a string interpolation script and explained the composite pattern with a view to ultimately being able to parse and populate this template: <ul> ${#if responses.length} ${#each responses as response} <li>${response.name}</li> ${#end each} ${#end if} ${#if !responses.length} <li><em>No responses</em></li> ${#end if} </ul> If you don’t […]

Creating a Template Engine Part 1: Groundwork

Although I strongly recommend using a popular, well tested engine, I believe that creating your own is a great learning experience. Since I’ve recently done this and couldn’t find any blog posts explaining the process, I thought I’d take the time to explain how one works, hopefully teaching a few budding JavaScripters looking to expand […]

Encapsulation Part 3: Objects

So far I’ve covered encapsulating arrays but objects are a far more common data type to encapsulate. The basic idea is to allow properties to be set, accessed, checked and removed without giving direct access to the object itself. You’ve almost certainly seen structures like this before. For consistency, setting will return the instance and […]

Encapsulation Part 1: Overview

Encapsulation is one of the four major principles of object-oriented programming (the others are abstraction, inheritance and polymorphism which I might cover in a later post). The basic idea behind encapsulation is to provide access to data while still hiding or protecting it. In this series of blog posts, I’ll show how this is done; […]

Help – I don’t know my JavaScript library!

You may have come across some scripts out in the wild that have different versions available for a few libraries and wondered how it’s done – surely the author didn’t write the same script 5 times, how on Earth would he remember to roll out the bug fixes across all the versions? You may also […]

How I Learned JavaScript

The thing with JavaScript is that no-one learns it. Everyone just jumps in (these days with copy-and-paste jQuery plugins) and struggles to take that knowledge further and learn more about the language. In this post I’ll describe my the key moments I’ve had (“JavaScript epiphanies” if you like) while learning; hopefully someone looking for the […]