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If you are a curly-braces programmer of a certain vintage, you will have done this a great deal in the past. for (let i = 0; i < shoes.length; i++) { const shoe = shoes[i]; // Your actual code here } This was preferable to referencing the janky shoes[i] within the loop, when “shoe” is […]
This article simply promotes the use of the statement if (x == null) when you want to check if a value is either null or undefined. I keep on having to explain this point, because catching null or undefined without side effects is important. If we break the statement down, there is a very important […]
This has been a problem for a long time. It was a problem with jQuery, it was a problem with AngularJS, it is a problem right now with Angular, Aurelia, Vue, and React. None of these frameworks are at fault, but there is a huge industry-wide issue with people writing all of their code inside […]
I was wondering whether we could be about to witness the death of the immediately invoked function expression (IIFE)? You know, we have been using IIFEs for a long time now to provide some scope for our stuff, because we don’t want to pollute the global scope, but there are two features that are now […]
As the JavaScript and TypeScript communities move towards module loading in greater numbers, the topic of bundling came up in conversation. Bundling has that deceptive sparkling aura of “best practice” around it that means people can think you should just use bundling as a default practice. I am hoping to disrupt this thinking, particularly for […]
We’ve all read JavaScript: The Good Parts, and there is plenty of wisdom in Douglas Crockford’s landmark work. His reminder that eval is evil has echoed through the JavaScript community and saved many people from a total mess. However, as programmers we must remain thinking individuals who question received wisdom. You must resist inappropriate use […]
Rather sadly, the FirefoxOS project got binned, which removed the momentum of the device sensor APIs that Mozilla was the big sponsor of. What this means for these APIs is that, while many are actually well through the standardisation process, the browser support is sketchy. Your motion and orientation sensor will show you very low […]
There are lots of ways to make an identity immutable and unconfusable. I’ll show just a couple, but first the principle behind it. Your identity should be immutable, because you will accumulate lots of threads back to your item that need that identity. If the identity changes, you will be breaking all of the relationships […]
Most JavaScript developers are very familiar with the Immediately Invoked Function Expression (IIFE): (function () { var x = ‘loaded’; console.log(x); }()); In this expression, we create a function that wraps all the enclosed code in its scope, and at the end we execute the function with the parentheses. If you aren’t super-careful though, you […]
The following script allows you to group all elements on a web page by a particular CSS value. So for example, if you specify ‘fontFamily’, you’ll get a list of font families used on the website, and a list of all elements using each one. You can specify other attributes if you would like to […]
