Run results for: Array.find vs. Map.get (small scale)

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 134

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

Map.get, 10 elements

111.3M/s

Map.get, 100 elements

106.3M/s

Array.find, 10 elements

55.7M/s

Array.find, 100 elements

10.5M/s

Array to Map + Map.get, 1 lookup

4.3M/s

Array.find, 10 lookups

3.8M/s

Array to Map + Map.get, 10 lookups

3.1M/s

Array to Map + Map.get, 100 lookups

786K/s

Array.find, 100 lookups

416K/s

View exact numbers

Test name	Executions per second
✓ Map.get, 10 elements	111,301,880 Ops/sec
Map.get, 100 elements	106,299,496 Ops/sec
Array.find, 10 elements	55,705,348 Ops/sec
Array.find, 100 elements	10,466,441 Ops/sec
Array to Map + Map.get, 1 lookup	4,338,972 Ops/sec
Array.find, 10 lookups	3,831,773 Ops/sec
Array to Map + Map.get, 10 lookups	3,121,109 Ops/sec
Array to Map + Map.get, 100 lookups	785,736 Ops/sec
Array.find, 100 lookups	416,247 Ops/sec

Script Preparation code:

function getRandomElement(id) {
  return {
    id,
    a: Math.random(),
    b: Math.random(),
    c: Math.random(),
  }
}

function getArray(length) {
  const result = [];
  for (let i = 0; i < length; i++) {
    result.push(getRandomElement(i))
  }
  
  return result;
}

function arrayToMap(array) {
  return new Map(array.map(el => [el.id, el]));
}

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

array_small = getArray(10);
array_large = getArray(100);

map_small = arrayToMap(array_small);
map_large = arrayToMap(array_large);

Tests:

Array.find, 10 elements
const target = getRandomInt(9999); array_small.find(el => el.id === target);
Map.get, 10 elements
const target = getRandomInt(9999); map_small.get(target);
Array.find, 100 elements
const target = getRandomInt(999999); array_large.find(el => el.id === target);
Map.get, 100 elements
const target = getRandomInt(999999); map_large.get(target)
Array to Map + Map.get, 1 lookup
const map = arrayToMap(array_small); const target = getRandomInt(9999); map.get(target);
Array to Map + Map.get, 10 lookups
const map = arrayToMap(array_small); for (let i = 0; i < 10; i++) { const target = getRandomInt(9999); map.get(target); }
Array to Map + Map.get, 100 lookups
const map = arrayToMap(array_small); for (let i = 0; i < 100; i++) { const target = getRandomInt(9999); map.get(target); }
Array.find, 10 lookups
for (let i = 0; i < 10; i++) { const target = getRandomInt(9999); array_small.find(el => el.id === target) }
Array.find, 100 lookups
for (let i = 0; i < 100; i++) { const target = getRandomInt(9999); array_small.find(el => el.id === target) }