mathiasbynens

// Here’s a 100% deterministic alternative to `Math.random`. Google’s V8 and
// Octane benchmark suites use this to ensure predictable results.

Math.random = (function() {
	var seed = 0x2F6E2B1;
	return function() {
		// Robert Jenkins’ 32 bit integer hash function
		seed = ((seed + 0x7ED55D16) + (seed << 12))  & 0xFFFFFFFF;
		seed = ((seed ^ 0xC761C23C) ^ (seed >>> 19)) & 0xFFFFFFFF;
		seed = ((seed + 0x165667B1) + (seed << 5))   & 0xFFFFFFFF;