Run results for: Object vs Map 5

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0

Browser: Firefox 140

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
✓ Map	72,482 Ops/sec
Obj	46,053 Ops/sec

Script Preparation code:

const rnd = () => Math.random().toString(36);

  const base = Array.from({length: 200}, () => [rnd(), rnd()]);

  const rndKey = () => base[Math.floor(Math.random() * base.length)][0];

  const map = new Map(base);

  const obj = Object.setPrototypeOf(Object.fromEntries(base), null);

  const acc = []; 

  function testMap() {
    const newKey = rnd();

    map.set(newKey, rnd());

    acc.push(
      map.get(rnd()),
      map.get(rndKey())
    ); // doing actual work

    map.set(rndKey(), rnd());

    map.delete(newKey);

    eval('acc.push("' + rnd() + '");');   // disable optimisations
    acc.length = 0; 
  }

  function testObj() {

    const newKey = rnd();

    obj[newKey] = rnd();

    acc.push(
      obj[rnd()],
      obj[rndKey()]
    ) // doing actual work

    obj[rndKey()] = rnd();

    delete obj[newKey];

    eval('acc.push("' + rnd() + '");');  // disable optimisations
    acc.length = 0; // doing actual work
  }