Run results for: hashin' nums & squashin' NaNs

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0.1 Waterfox/56.0.1

Browser: Firefox 56

Operating system: Windows 7

Device Platform: Other

Date tested: 2024 years ago

Test name	Executions per second
h1	27025.3 Ops/sec
h2	26170.5 Ops/sec

HTML Preparation code:

<script>
'use strict';

const float64 = (a, b) => {
	let x = new Uint32Array(2);
	let y = new Float64Array(x.buffer);
	x[0] = a|0;
	x[1] = b|0;
	return y[0];
};

const float32 = (a) => {
	let x = new Uint32Array(1);
	let y = new Float64Array(x.buffer);
	x[0] = a|0;
	return y[0];
};

const floatParts = (n) => {
	let x = new Uint32Array(2);
	let y = new Float64Array(x.buffer);
	y[0] = n;
	return [...x];
};

const randNum = () =>
	float64(
		(Math.random() * 0xffffffff)|0,
		(Math.random() * 0xffffffff)|0);

const randSpecial = () =>
	float64(
		(Math.random() * 0xffffffff)|0,
		(Math.random() * 0xffffffff)|0b01111111111100000000000000000000);

const nums = [...Array(5000)]
	.map(randNum)
	.concat([NaN, Infinity, -Infinity, -0, +0]);

// -----------------------------------------
  
const u32s = new Uint32Array(2);
const f64s = new Float64Array(u32s.buffer);

const numberHash1 = function() {
  'use strict';
	f64s[0] = this;

	f64s[0] = f64s[0];
	return u32s[0] ^ u32s[1];
};

const numberHash2 = function() {
  'use strict';
	f64s[0] = this;

	const u32s1 = u32s[1];
	const mask = ~((u32s1 === 0b11111111111110000000000000000000) << 31);
	return u32s[0] ^ (mask & u32s1);
};
  
</script>

Tests:

h1
let sum = 0; for (let i = 0, len = nums.length; i < len; ++i) { sum += numberHash1.call(nums[i]); };
h2
let sum = 0; for (let i = 0, len = nums.length; i < len; ++i) { sum += numberHash2.call(nums[i]); };