Aleksey Konakov AlekseyKonakov

Hidden classes in JavaScript and Inline Caching

Knowing how internals work is always a good. Pretty much for everything. Cars, trains, computers, you name it. It gives you an insight on what happens under the hood. You also act/react differently based on this knowledge.

As you might have guessed, it’s also true for web development. Knowledge of CSS transitions allows you to achieve better performance and not to use JavaScript in most cases. Knowledge of V8 internals allows you to write more performant JavaScript code. So let’s talk about V8 a little.

A little about V8

V8 is a JavaScript engine built by Google. Firefox built SpiderMonkey, Opera built Carakan and Microsoft built Chakra. One very important difference between V8 and other JavaScript engines is that V8 doesn’t generate any intermediate code. It compiles JavaScr

	/*
	This code is public domain.

	The MurmurHash3 algorithm was created by Austin Appleby and put into the public domain. See http://code.google.com/p/smhasher/

	This C# variant was authored by
	Elliott B. Edwards and was placed into the public domain as a gist
	Status...Working on verification (Test Suite)
	Set up to run as a LinqPad (linqpad.net) script (thus the ".Dump()" call)
	*/