Run results for: Optimizing Code: Sets vs Array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 OPR/122.0.0.0

Browser: Opera 122

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

126.0M/s

22.3M/s

View exact numbers

Test name	Executions per second
✓ 1	125,979,032 Ops/sec
2	22,328,280 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

// исходные данные
var arr = [
  {id: 'a'}, 
  {id: 'b'}, 
  {id: 'c'}, 
  {id: 'd'}, 
  {id: 'e'}, 
  {id: 'f'}
];

var obj = {
  a: { id: 'a'}, 
  b: { id: 'b'}, 
  c: { id: 'c'}, 
  d: { id: 'd'}, 
  e: { id: 'e'}, 
  f: { id: 'f'}
};

var target = 'f';

// функция преобразования массива в объект
function buildMap(array) {
  const out = {};
  for (let i = 0; i < array.length; i++) {
    const item = array[i];
    out[item.id] = item;
  }
  return out;
}

Tests:

1
arr.find(x => x.id === target);
2
const map = buildMap(arr); map[target];