Random function

Random.js

// Random function w/ seed
/*
// seeding -> cyrb128 + mulberry32
let random = _createRandom(seed?);
// Use
random() -> 0 to < 1
random(5,15) -> 5 to < 15
*/
function _createRandom(seed = "") {
	let cyrb128 = (str) => {
		let h1 = 1779033703,
			h2 = 3144134277,
			h3 = 1013904242,
			h4 = 2773480762;
		for (let i = 0, k; i < str.length; i++) {
			k = str.charCodeAt(i);
			h1 = h2 ^ Math.imul(h1 ^ k, 597399067);
			h2 = h3 ^ Math.imul(h2 ^ k, 2869860233);
			h3 = h4 ^ Math.imul(h3 ^ k, 951274213);
			h4 = h1 ^ Math.imul(h4 ^ k, 2716044179);
		}
		h1 = Math.imul(h3 ^ (h1 >>> 18), 597399067);
		h2 = Math.imul(h4 ^ (h2 >>> 22), 2869860233);
		h3 = Math.imul(h1 ^ (h3 >>> 17), 951274213);
		h4 = Math.imul(h2 ^ (h4 >>> 19), 2716044179);
		return [
			(h1 ^ h2 ^ h3 ^ h4) >>> 0,
			(h2 ^ h1) >>> 0,
			(h3 ^ h1) >>> 0,
			(h4 ^ h1) >>> 0,
		];
	};
	let mulberry32 = (a) => {
		return function () {
			var t = (a += 0x6d2b79f5);
			t = Math.imul(t ^ (t >>> 15), t | 1);
			t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
			return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
		};
	};
	// w/seed
	if (seed !== "") {
		const r = mulberry32(cyrb128(seed)[0]);
		return r;
	}
	// just random
	if (seed === "") {
		return Math.random;
	}
	return 0;
}
function createRandom(seed = "") {
	let r = _createRandom(seed);
	return function (a, b) {
		if (arguments.length == 0) {
			return r();
		}
		return r() * (b - a) + a;
	};
}