Repeatable pseudo-random number generator based on predictable input values

pseudo-random.js

import hash from 'string-hash';

function stringHash(s) {
	if (s.length === 1) {
		return s.charCodeAt(0);
	}

	return hash(s);
}

function random(initial) {
	let seed = (initial | 0) + 0x2F6E2B1;
	seed = (seed + 0x7ED55D16 + seed << 12) & 0xFFFFFFFF;
	seed = (seed ^ 0xC761C23C ^ seed >>> 19) & 0xFFFFFFFF;
	seed = (seed + 0x165667B1 + seed << 5) & 0xFFFFFFFF;
	seed = (seed + 0xD3A2646C ^ seed << 9) & 0xFFFFFFFF;
	seed = (seed + 0xFD7046C5 + seed << 3) & 0xFFFFFFFF;
	seed = (seed ^ 0xB55A4F09 ^ seed >>> 16) & 0xFFFFFFFF;
	return (seed & 0xFFFFFFF) / 0x10000000;
}

// example, getting random seed from row index, field id and data value
const valueSeed = typeof value === 'number' ? value : stringHash(String(value));

console.log(random(Math.floor(fieldId) + Math.floor(rowIndex) + valueSeed));