Benchmark: Object.assign vs Array for

Tests:

Object.assign
const obj1 = {"a": 1, "b": 1, "c": 1, "d": 1, "e": 1, "f": 1, "g": 1, "h": 1, "i": 1, "j": 1, "k": 1, "l": 1, "m": 1, "n": 1}; const obj2 = {"o": 1, "p": 1, "q": 1, "r": 1, "s": 1, "t": 1, "u": 1, "v": 1, "w": 1, "x": 1, "y": 1, "z": 1, "*": 1, "-": 1}; Object.assign(obj1, obj2);
Array for
const obj1 = {"a": 1, "b": 1, "c": 1, "d": 1, "e": 1, "f": 1, "g": 1, "h": 1, "i": 1, "j": 1, "k": 1, "l": 1, "m": 1, "n": 1}; const arr2 = ["o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "*", "-"]; for (let i = 0; i <= arr2.length; i++) { obj1[arr2[i]] = 1; }

Rendered benchmark preparation results:

Previous results

Test case name	Result
Object.assign
Array for

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Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser/OS: Chrome 69 on Windows 8.1

Test name	Executions per second
Object.assign	1879974.0 Ops/sec
Array for	2365531.0 Ops/sec

Object.assign vs Array for (version: 0)