Run results for: Array.from vs Spread vs Iterate

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Browser: Chrome 70

Operating system: Mac OS X 10.14.0

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Array.from	29648.8 Ops/sec
Spread	1165154.0 Ops/sec
Iterate	1468367.0 Ops/sec
Iterate with pre-allocated array	1437936.0 Ops/sec

Script Preparation code:

var fooSet = new Set();
for(var i=0;i<100;i++) {
  fooSet.add(i);
}

Tests:

Array.from
var other = Array.from(fooSet);
Spread
var other = [...fooSet];
Iterate
let other = []; for (const v of fooSet) { other.push(v); }
Iterate with pre-allocated array
let other = new Array(fooSet.size); let i = 0; for (const v of fooSet) { other[i++] = v; }