Run results for: Array.from vs spread vs construct manually 5

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:82.0) Gecko/20100101 Firefox/82.0

Browser: Firefox 82

Operating system: Mac OS X 10.16

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var src = Object.keys([...Array(10000)]);

Tests:

Array.from
var z = {}; z.z = Array.from(src[Symbol.iterator]());
manual
var z = {}; let n = src.length; let a = Array(n); let iter = src[Symbol.iterator](); for (let i = 0; i < n; ++i) {a[i] = iter.next().value;}; z.z = a;
spread
var z = {}; z.z = [...(src[Symbol.iterator]())];
manual 2
var z = {}; let a = Array(src.length); let iter = src[Symbol.iterator](); for (let i = 0, obj = iter.next(); !obj.done; obj = iter.next()) { a[i++] = obj.value;}; z.z = a;
manual 3
var z = {}; let n = src.length; let a = Array(n); let iter = src[Symbol.iterator](); for (let i = n - 1; i >= 0; --i) {a[i] = iter.next().value;}; z.z = a;