Run results for: Array.find vs. Map.get fork23

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Array.find, 10 000 elements	1259967.4 Ops/sec
Map.get, 10 000 elements	1285575.4 Ops/sec
Array.find, 1 000 000 elements	1260852.5 Ops/sec
Map.get, 1 000 000 elements	1353731.2 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(3);

small_idxs = array_small.map(o => o.id);

array_large = getArray(10);

large_idxs = array_large.map(o => o.id);

map_small = arrayToMap(array_small);
map_large = arrayToMap(array_large);

Tests:

Array.find, 10 000 elements
const target = small_idxs[getRandomInt(2)]; array_small.find(el => el.id === target);
Map.get, 10 000 elements
const target = small_idxs[getRandomInt(2)]; map_small.get(target);
Array.find, 1 000 000 elements
const target = large_idxs[getRandomInt(9)]; array_large.find(el => el.id === target);
Map.get, 1 000 000 elements
const target = large_idxs[getRandomInt(9)]; map_large.get(target)

Run results for: Array.find vs. Map.get fork23

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