Run results for: Arrays vs Objects

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36

Browser: Chrome 72

Operating system: Mac OS X 10.11.6

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Array (Array.find)	0.2 Ops/sec
Object	781.4 Ops/sec

Script Preparation code:

var testIds = [], storeArray = [], storeObject = {}, size = 300000, selectSize = size/100, i, defData = '12345678';

function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
}

for (i=0; i<size; i++) {
  var id = 'id' + i;
  storeArray.push({
    id: id,
    n:  i,
    data: defData
  });
}

for (i=0; i<size; i++) {
  var id = 'id' + i;
  storeObject[id] = {
    id: id,
    n:  i,
    data: defData
  };
}

for (i=0;i<selectSize;i++) {
  var id = 'id' + getRandomInt(1, size);
  testIds.push(id);
}

console.log(testIds);

Tests:

Array (Array.find)
var x = 0; for (i=0;i<selectSize;i++) { var id = testIds[i]; var it = storeArray.find(function(el, idx, arr) { if (el.id == id) return true; return false; }); x += it.n; }
Object
var x = 0; for (i=0;i<selectSize;i++) { var id = testIds[i]; var it = storeObject[id]; x += it.n; }

Run results for: Arrays vs Objects

Array (Array.find)

Object