Run results for: Set.has vs Array.includes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Array.includes - small	795712.4 Ops/sec
Set.has - small	5627109.0 Ops/sec
Array.includes - large	220691.3 Ops/sec
Set.has - large	5623946.0 Ops/sec

Script Preparation code:

function range(s, e) {
  const xs = [];
  for (let i=s; i<e; i++) xs.push(i);
  return xs;
}
const pow = y => x => Math.pow(y, x);
const p10 = pow(10);

// [10, 100, ..., 1_000_000]
const xss = range(1, 7)
  .map(i => range(0, p10(i)));

const sxss = xss
  .map(xs => new Set(xs));

var yss = range(1, 7)
  .map(i => range(1, 9)
    .map(j => j * p10(i))
  );

var smallXss = xss.slice(0, 3);
var largeXss = xss.slice(3);

var smallSxss = sxss.slice(0, 3);
var largeSxss = sxss.slice(3);

Tests:

Array.includes - small
const xss = smallXss; const n = xss.length; const n2 = yss[0].length; for (let i = 0; i < n; i++) { const xs = xss[i]; const ys = yss[i]; for (let j = 0; j < n2; j++) { xs.includes(ys[j]); } }
Set.has - small
const xss = smallSxss; const n = xss.length; const n2 = yss[0].length; for (let i = 0; i < n; i++) { const xs = xss[i]; const ys = yss[i]; for (let j = 0; j < n2; j++) { xs.has(ys[j]); } }
Array.includes - large
const xss = largeXss; const n = xss.length; const n2 = yss[0].length; for (let i = 0; i < n; i++) { const xs = xss[i]; const ys = yss[i]; for (let j = 0; j < n2; j++) { xs.includes(ys[j]); } }
Set.has - large
const xss = largeSxss; const n = xss.length; const n2 = yss[0].length; for (let i = 0; i < n; i++) { const xs = xss[i]; const ys = yss[i]; for (let j = 0; j < n2; j++) { xs.has(ys[j]); } }

Run results for: Set.has vs Array.includes

Array.includes - small

Set.has - small

Array.includes - large

Set.has - large