The Two-line JavaScript Design Pattern That Covers A Multitude Of Sins

The Two-line JavaScript Design Pattern That Covers A Multitude Of Sins

Because nothing is fool-proof to a talented fool.

What’s the problem? 😩

There’s always one isn’t there? That junior dev who writes things like if (x === undefined), or that one package that pollutes the global scope with loads of garbage you don’t need. Or maybe it’s a bit of self-sabotage — you spend ages debugging some obscure issue and cursing whoever caused it, only to find that actually it was you who screwed up 😅

Despite the incredible progress the JavaScript ecosystem has made over the last decade, there’s still a million ways some careless code can ruin your day.

If you’re a front-end developer you’ll know exactly what I’m talking about, especially if you ever have to work outside of a framework. There’s only so much a coding standards guide can do — it can’t cover for carelessness or a lack of understanding of how a language works.

Or can it…

What’s the solution? 💡

The following programming pattern shields your code from almost every sloppy mistake made elsewhere in your app, including imported libraries, and it does it in just two lines — short enough for anyone to remember:

;(function(window, undefined) {
  // Do stuff here
})(this);

Doesn’t look like much, does it? Its simplicity is deceptive though, there’s actually quite a lot to unpack. Let’s dive in.

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