Run results for: Benchmark of Object.keys multiple calls

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.79 Safari/537.36

Browser: Chrome 79

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Cache	713744.6 Ops/sec
Not Cached	518589.6 Ops/sec

Script Preparation code:

var object = {
  1: 2,
  3: 4,
  5: 6,
  7: 8,
  9: 10,
}

Tests:

Cache
const cached = Object.keys(object); const sum = 0; for (let index = 0; index < cached; index++) { sum += cached[index]; } for (let index = 0; index < cached; index++) { sum += cached[index]; }
Not Cached
const sum = 0; for (let index = 0; index < Object.keys(object); index++) { sum += cached[index]; } for (let index = 0; index < Object.keys(object); index++) { sum += cached[index]; }