Keep

Benchmark created on August 5, 2024

Setup

const as = [];
for (let i = 0; i < 1000; i++) {
	as.push(i);
}

function keep(arr, f) {
  return arr.map(f).filter((b) => b !== null);
}

function keep2(arr, f) {
  return arr.reduce((result, a) => {
    const b = f(a);
    if (b !== null) {
      result.push(b);
    }
    return result;
  }, []);
}

function keep3(arr, f) {
  const result = [];
  for (const a of arr) {
    const b = f(a);
    if (b !== null) {
      result.push(b);
    }
  }
  return result;
}

function mogrify(x) {
	const r = Math.random();
	if (r > 0) {
		return x + (x * r);
	} else {
		return null;
	}
}

Test runner

keep(as, mogrify);

keep2(as, mogrify);

keep3(as, mogrify);

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

• Revision 1: published on August 5, 2024