Run results for: for vs foreach ej

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36 Edg/113.0.1774.35

Browser: Chrome 113

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
.forEach	6.4 Ops/sec
for	12.9 Ops/sec
for name first	11.5 Ops/sec

Script Preparation code:

function generateTestArray() {
  const result = [];
  for (let i = 0; i < 1000000; ++i) {
    result.push({
      a: i,
      b: i / 2,
      r: 0,
    });
  }
  return result;
}

Tests:

.forEach
const array = generateTestArray(); array.forEach((x) => { x.r = x.a + x.b; });
for
const array = generateTestArray(); for(let index = 0; index < array.length; index++) { array[index].r = array[index].a + array[index].b; }
for name first
const array = generateTestArray(); for(let index = 0; index < array.length; index++) { const value = array[index] value.r = value.a + value.b; }

Run results for: for vs foreach ej

.forEach

for

for name first