Run results for: Array.find vs. Map.get with very little items

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36

Browser: Chrome 139

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
Array.find, 10 000 elements	34377560.0 Ops/sec
Map.get, 10 000 elements	63384384.0 Ops/sec
Array.find, 1 000 000 elements	29481758.0 Ops/sec
Map.get, 1 000 000 elements	62669976.0 Ops/sec
Array to Map + Map.get, 1 lookup	12016540.0 Ops/sec
Array to Map + Map.get, 10 lookups	6146932.0 Ops/sec
Array to Map + Map.get, 100 lookups	1109418.5 Ops/sec
Array.find, 10 lookups	4642073.0 Ops/sec
Array.find, 100 lookups	484548.8 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(2);
array_large = getArray(5);

map_small = arrayToMap(array_small);
map_large = arrayToMap(array_large);

Tests:

Array.find, 10 000 elements
const target = getRandomInt(3); array_small.find(el => el.id === target);
Map.get, 10 000 elements
const target = getRandomInt(3); map_small.get(target);
Array.find, 1 000 000 elements
const target = getRandomInt(6); array_large.find(el => el.id === target);
Map.get, 1 000 000 elements
const target = getRandomInt(6); map_large.get(target)
Array to Map + Map.get, 1 lookup
const map = arrayToMap(array_small); const target = getRandomInt(3); 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(3); 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(3); map.get(target); }
Array.find, 10 lookups
for (let i = 0; i < 10; i++) { const target = getRandomInt(3); array_small.find(el => el.id === target) }
Array.find, 100 lookups
for (let i = 0; i < 100; i++) { const target = getRandomInt(3); array_small.find(el => el.id === target) }

Run results for: Array.find vs. Map.get with very little items

Test the performance of Array.find vs. Map.get, with various array sizes, and with/without conversion from array to map

Array.find, 10 000 elements

Map.get, 10 000 elements

Array.find, 1 000 000 elements

Map.get, 1 000 000 elements

Array to Map + Map.get, 1 lookup

Array to Map + Map.get, 10 lookups

Array to Map + Map.get, 100 lookups

Array.find, 10 lookups

Array.find, 100 lookups