Run results for: Array.from(iterable) vs [...iterable]

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 151

Operating system: Android

Device Platform: Mobile

Date tested: 3 days ago

arraySpreadSmallArray

44.6M/s

arrayFromSmallArray

42.2M/s

arraySpreadSmallSet

25.8M/s

arrayFromSmallSet

23.4M/s

arraySpreadSmallIterable

1.8M/s

arrayFromSmallIterable

1.7M/s

arraySpreadBigArray

512K/s

arrayFromBigArray

437K/s

arrayFromBigSet

50K/s

arraySpreadBigSet

50K/s

arrayFromBigIterable

3K/s

arraySpreadBigIterable

2K/s

View exact numbers

Test name	Executions per second
✓ arraySpreadSmallArray	44,634,292 Ops/sec
arrayFromSmallArray	42,209,876 Ops/sec
arraySpreadSmallSet	25,801,042 Ops/sec
arrayFromSmallSet	23,390,784 Ops/sec
arraySpreadSmallIterable	1,843,716 Ops/sec
arrayFromSmallIterable	1,650,656 Ops/sec
arraySpreadBigArray	512,347 Ops/sec
arrayFromBigArray	437,280 Ops/sec
arrayFromBigSet	50,358 Ops/sec
arraySpreadBigSet	49,549 Ops/sec
arrayFromBigIterable	2,959 Ops/sec
arraySpreadBigIterable	2,350 Ops/sec

Script Preparation code:

const smallArray = new Array();
const smallSet = new Set();
for (let i = 0; i < 10; ++i) {
	smallArray.push(i);
  smallSet.add(i)
}
const smallIterable = function*() {
  for (let i = 0; i < 10; ++i) {
    yield i;
  }
}

const bigArray = new Array();
const bigSet = new Set();
for (let i = 0; i < 10000; ++i) {
	bigArray.push(i);
  bigSet.add(i)
}
const bigIterable = function*() {
  for (let i = 0; i < 10000; ++i) {
    yield i;
  }
}

Tests:

arrayFromSmallArray
const arrayFromSmallArray = Array.from(smallArray);
arrayFromSmallSet
const arrayFromSmallSet = Array.from(smallSet);
arrayFromSmallIterable
const arrayFromSmallIterable = Array.from(smallIterable());
arraySpreadSmallArray
const arraySpreadSmallArray = [...smallArray];
arraySpreadSmallSet
const arraySpreadSmallSet = [...smallSet];
arraySpreadSmallIterable
const arraySpreadSmallIterable = [...smallIterable()];
arrayFromBigArray
const arrayFromBigArray = Array.from(bigArray);
arrayFromBigSet
const arrayFromBigSet = Array.from(bigSet);
arrayFromBigIterable
const arrayFromBigIterable = Array.from(bigIterable());
arraySpreadBigArray
const arraySpreadBigArray = [...bigArray];
arraySpreadBigSet
const arraySpreadBigSet = [...bigSet];
arraySpreadBigIterable
const arraySpreadBigIterable = [...bigIterable()];