Quake style 1.0/sqrt(x)
JavaScript
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rsqrt.js

README.md

rsqrt

An attempt to port Quake's fast inverse square root to JS. Do not ever use this.

Install:

npm install rsqrt

Example:

console.log(require("rsqrt")(100.0))  //Prints out approximately 0.1

require("rsqrt")(number)

Computes an approximation for 1.0 / Math.sqrt(number)

Should I ever use this?

No. 1.0 / Math.sqrt is at least twice as fast.

Why did you publish this?

To warn others.

Credits

(c) 2013 Mikola Lysenko. MIT License