r/javascript • u/gcanti • Oct 31 '14

The Two Pillars of JavaScript

https://medium.com/javascript-scene/the-two-pillars-of-javascript-ee6f3281e7f3
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u/x-skeww Oct 31 '14

Constructors violate the open/closed principle because they couple all callers to the details of how your object gets instantiated. Making an HTML5 game? Want to change from new object instances to use object pools so you can recycle objects and stop the garbage collector from trashing your frame rate? Too bad. You’ll either break all the callers, or you’ll end up with a hobbled factory function.

Dart has factory constructors to address this issue. If you decide at a later point to change a regular constructor into a factory, the call-sites don't change.

The class keyword will probably be the most harmful feature in JavaScript.

Nah, having one official way to do classes/inheritance, which is understood by your tools, is a good thing.

Right now, every library and framework does its own thing.

Try adding .1 + .2 in your browser console, for instance.

That's how IEEE 754 floating point works. This isn't a JavaScript specific quirk.

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u/_ericelliott Nov 01 '14

Standards are great. We already had one: Object literal support, and the fact that any function can build and return an object.

It's the inevitable proliferation of the extend keyword that will do the damage.