Run results for: Spread Performance for Object & Arrays 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36

Browser: Chrome 70

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Object.assign	3114307.0 Ops/sec
Object spread	1507280.0 Ops/sec
Array.prototype.concat	4895929.0 Ops/sec
Array.prototype.push (grouped)	25761480.0 Ops/sec
Array.prototype.push (single)	28622940.0 Ops/sec
Array Spread	21541490.0 Ops/sec

Tests:

Object.assign
const object1 = { a: 1, b: 2, c: 3 }; const object2 = Object.assign({c: 4, d: 5}, object1);
Object spread
const object1 = { a: 1, b: 2, c: 3 }; const object2 = {c: 4, d: 5, ...object1};
Object Indexed Add
const object2 = {c: 4, d: 5}; object2["a"] = 1; object2["b"] = 2; object2["c"] = 3;
Object Dot Add
const object2 = {c: 4, d: 5}; object2.a = 1; object2.b = 2; object2.c = 3;
Array.prototype.concat
const array1 = [ "hello", true, 7 ]; const array2 = [ 1, 2 ].concat(array1);
Array.prototype.push (grouped)
const array1 = [ "hello", true, 7 ]; [ 1, 2 ].push("hello", true, 7)
Array.prototype.push (single)
const array1 = [ 1, 2 ] array1.push("hello") array1.push(true) array1.push(7)
Array Spread
const array1 = [ 1, 2 ] const array2 = ["hello", true, 7, ...array1]