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JavaScript

A collection of 11 posts

Simple JavaScript profiling timer script.

Simple JavaScript profiling timer script.

I had a need to write a small script that I could easily use to time bits of JavaScript code in order to profile it. Chrome's dev tools has lots of useful profiling tools but sometimes you just want some helpful code snippets. var timers = []; function startTimer(name) { for (var

Getting Too Modular

Getting Too Modular

Over the last year or so I've fallen in love with node [http://nodejs.org] and even JavaScript as a language (the good parts, of course). I was very pleased to find that the node community embraces small modules (aka packages) that have one job and they do it well.

What are callbacks and promises?

What are callbacks and promises?

To explain promises we must first explain callbacks. A callback function is simply a function you pass into another function so that function can call it at a later time. This is commonly seen in asynchronous APIs [http://en.wikipedia.org/wiki/Application_programming_interface]; the API call returns immediately

9 JavaScript Tips You May Not Know

> NOTE: This is a blog post from 2006 by a now 34 year old programmer named Ayman Hourieh. I found links to his site for an article I wanted to read but his site is down and looks like it's been down for quite some time. I used The Wayback

String Replacement is Natively Supported by console.log()

I recently found out that console.log() in JavaScript natively supports string replacement using %s as a placeholder and I wanted to share. console.log('My name is %s.', 'Alex'); // My name is Alex. In addition you can use %s as many times as you have arguments and it

JavaScript Partial Application with bind()

Sometimes the subtle ways other people use JavaScript puts a smile on my face. I'm getting started with the Mongoose driver [https://npmjs.org/package/mongoose] for MongoDB [http://www.mongodb.org/]; while I was reading the quick start guide [http://mongoosejs.com/docs/index.html] I came across the

Monkey Patching

There are plenty of moments as a developer when you do something so clever that you just have to crack a little smile and be proud of yourself for a bit. When I'm writing JavaScript code many of these moments come in the form of monkey patches [http://en.wikipedia.

I Finally Understand Closures!

I Finally Understand Closures!

Since I started using Node I've fallen in love with JavaScript as a language. Before Node I liked JavaScript well enough, but without my trusty JQuery library it never impressed me much at all. Node has forced me to actually build a proper understanding of the JavaScript language itself. I've

How to Implement Auto-Save in your Web App

How to Implement Auto-Save in your Web App

Have you ever accidentally unfocused the textarea you were typing in and then hit backspace only to have the entire browser go back a page and blow away everything you were typing? Losing work is one of the most irritating things a user can experience in a web application. Today

Using custom jQuery events will save you a lot of headaches.

If you use JQuery [http://jquery.com/] then you have likely already done events like this: $('button').click(function (e) { alert('hello!'); }); JQuery's event wrapper is very useful and it allows you to easily bind to common DOM events like click, keypress, change, etc. But did you know that

Using Self-executing Functions to Preserve Dollar Sign compatibility in JQuery

This is a very simple concept and is mostly common knowledge but I recently came across a need to use it fairly extensively and figured I would share. At my place of work we decided to adopt JQuery [http://jquery.com/] as our javascript framework. The problem we had is