Run results for: Object vs Map, literal keys

Test name	Executions per second
✓ initialized object	2,268,104 Ops/sec
non-initialized object	1,803,880 Ops/sec
map	73,536 Ops/sec

non-initialized object

for (let n = 0; n < 50; n++) {
  if (n === 0) {
    o1.key0 = 0;
    o1.key1 = 0;
    o1.key2 = 0;
    o1.key3 = 0;
    o1.key4 = 0;
    o1.key5 = 0;
    o1.key6 = 0;
    o1.key7 = 0;
    o1.key8 = 0;
    o1.key9 = 0;
  } else {
    o1.key0 += 1;
    o1.key1 += 1;
    o1.key2 += 1;
    o1.key3 += 1;
    o1.key4 += 1;
    o1.key5 += 1;
    o1.key6 += 1;
    o1.key7 += 1;
    o1.key8 += 1;
    o1.key9 += 1;
  }
}

initialized object

for (let n = 0; n < 50; n++) {
  if (n === 0) {
    o2.key0 = 0;
    o2.key1 = 0;
    o2.key2 = 0;
    o2.key3 = 0;
    o2.key4 = 0;
    o2.key5 = 0;
    o2.key6 = 0;
    o2.key7 = 0;
    o2.key8 = 0;
    o2.key9 = 0;
  } else {
    o2.key0 += 1;
    o2.key1 += 1;
    o2.key2 += 1;
    o2.key3 += 1;
    o2.key4 += 1;
    o2.key5 += 1;
    o2.key6 += 1;
    o2.key7 += 1;
    o2.key8 += 1;
    o2.key9 += 1;
  }
}

map

for (let n = 0; n < 50; n++) {
  if (n === 0) {
    m.set('key0', 0);
    m.set('key1', 0);
    m.set('key2', 0);
    m.set('key3', 0);
    m.set('key4', 0);
    m.set('key5', 0);
    m.set('key6', 0);
    m.set('key7', 0);
    m.set('key8', 0);
    m.set('key9', 0);
  } else {
    m.set('key0', m.get('key0') + 1);
    m.set('key1', m.get('key1') + 1);
    m.set('key2', m.get('key2') + 1);
    m.set('key3', m.get('key3') + 1);
    m.set('key4', m.get('key4') + 1);
    m.set('key5', m.get('key5') + 1);
    m.set('key6', m.get('key6') + 1);
    m.set('key7', m.get('key7') + 1);
    m.set('key8', m.get('key8') + 1);
    m.set('key9', m.get('key9') + 1);
  }
}