Run results for: Array.from vs spread vs construct manually 2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

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

Tests:

Array.from
z.z = Array.from(src[Symbol.iterator]());
manual
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
z.z = [...(src[Symbol.iterator]())];
manual 2
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;