Run results for: Option[Int]: box vs unbox

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
box	64398.2 Ops/sec
unbox	14884.4 Ops/sec
unbox2	61359.3 Ops/sec

Script Preparation code:

function None() {
}
None.prototype.tag = 0;
const none = new None();
function Some(payload) {
  this.payload = payload;
}
Some.prototype.tag = 1;

var box = [];
var unbox = [];
var unbox2 = [];
for (let i = 0; i < 1000; i++) {
  box.push(i % 2 == 0 ? none : new Some(i));
  unbox.push(i % 2 == 0 ? undefined : i);
  unbox2.push(i % 2 == 0 ? 4294967296 : i + 0);
}

function square(i) {
  return i * i | 0
}

Tests:

box
for (let i of box) { if (i.tag === 1) { square(i.payload) } }
unbox
for (let i of unbox) { if (i !== undefined) { square(i) } }
unbox2
for (let i of unbox2) { if (i === 4294967296) { square(i | 0) } }