Run results for: Array.find vs. Map.get by array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 OPR/114.0.0.0

Browser: Opera 114

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Map.get, 1 000 000 elements

60.0M/s

Map.get, 100 elements

58.1M/s

Array.find, 100 elements

10.7M/s

Array.find, 10 lookups

683K/s

Array to Map + Map.get, 1 lookup

299K/s

Array to Map + Map.get, 10 lookups

294K/s

Array to Map + Map.get, 100 lookups

235K/s

Array.find, 100 lookups

67K/s

Array.find, 1 000 000 elements

30K/s

View exact numbers

Test name	Executions per second
✓ Map.get, 1 000 000 elements	60,034,052 Ops/sec
Map.get, 100 elements	58,079,804 Ops/sec
Array.find, 100 elements	10,705,738 Ops/sec
Array.find, 10 lookups	683,254 Ops/sec
Array to Map + Map.get, 1 lookup	299,121 Ops/sec
Array to Map + Map.get, 10 lookups	294,244 Ops/sec
Array to Map + Map.get, 100 lookups	234,920 Ops/sec
Array.find, 100 lookups	67,374 Ops/sec
Array.find, 1 000 000 elements	29,872 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 getArrays(length) {
    const result = new Array(length).fill(0);;
    for (let i = 0; i < length; i++) {
        result[i] = (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 = getArrays(100);
array_large = getArrays(10000);

map_small = arrayToMap(array_small);
map_large = arrayToMap(array_large);

Tests:

Array.find, 100 elements
const target = getRandomInt(99); array_small.find(el => el.id === target);
Map.get, 100 elements
const target = getRandomInt(99); map_small.get(target);
Array.find, 1 000 000 elements
const target = getRandomInt(999999); array_large.find(el => el.id === target);
Map.get, 1 000 000 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) }