Benchmark: tiny Array.find vs. Map.get

tiny Array.find vs. Map.get (version: 1)

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

Comparing performance of: Array.find, 5 elements vs Map.get, 5 elements vs Array to Map + Map.get, 1 lookup vs Array to Map + Map.get, 10 lookups vs Array to Map + Map.get, 100 lookups vs Array.find, 10 lookups vs Array.find, 100 lookups

Created: 5 months ago by: Guest

Jump to the latest result

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(5);
array_large = getArray(5);

map_small = arrayToMap(array_small);
map_large = arrayToMap(array_large);

Tests:

Array.find, 5 elements
const target = getRandomInt(4); array_small.find(el => el.id === target);
Map.get, 5 elements
const target = getRandomInt(4); map_small.get(target);
Array to Map + Map.get, 1 lookup
const map = arrayToMap(array_small); const target = getRandomInt(4); 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(4); 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(4); map.get(target); }
Array.find, 10 lookups
for (let i = 0; i < 10; i++) { const target = getRandomInt(4); array_small.find(el => el.id === target) }
Array.find, 100 lookups
for (let i = 0; i < 100; i++) { const target = getRandomInt(4); array_small.find(el => el.id === target) }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find, 5 elements
Map.get, 5 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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.find, 5 elements	44489396.0 Ops/sec
Map.get, 5 elements	109855464.0 Ops/sec
Array to Map + Map.get, 1 lookup	9037089.0 Ops/sec
Array to Map + Map.get, 10 lookups	6343934.5 Ops/sec
Array to Map + Map.get, 100 lookups	1616142.6 Ops/sec
Array.find, 10 lookups	5616477.0 Ops/sec
Array.find, 100 lookups	597641.4 Ops/sec

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