Run results for: Map() vs Object() on write and read

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Map

90/s

Object Iteration

8/s

View exact numbers

Test name	Executions per second
✓ Map	90 Ops/sec
Object Iteration	8 Ops/sec

Script Preparation code:

function filter(v) {
  return v % 2
}

Tests:

Map
const test = new Map() for (var i=10000; i > 0; i--) { test.set(`key${i}`, i) } for (var i=100; i > 0; i--) { Array.from(test.values()).filter(filter) }
Object Iteration
const test = {} for (var i=10000; i > 0; i--) { test[`key${i}`] = i } for (var i=100; i > 0; i--) { const values = []; for (const id in test) { const value = test[id]; if (filter(value)) { values.push(value); } } }