Run results for: ??= vs manual 3

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

??=

132/s

manual

87/s

View exact numbers

Test name	Executions per second
✓ ??=	132 Ops/sec
manual	87 Ops/sec

Script Preparation code:

function rand() {
  return Math.floor(Math.random * 10000);
}

Tests:

??=
const a = Array.from({ length: 10000 }) for (let i = 0; i < 10000; i++) { const idx = rand() a[idx] ??= 0 a[idx] += 1 }
manual
const a = Array.from({ length: 10000 }) for (let i = 0; i < 10000; i++) { const idx = rand() if (!a[idx]) a[idx] = 0 a[idx] += 1 }