Run results for: Object.assign vs dot notation performance 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

dot notation - single value

15.1M/s

Object.assign - single value

3.6M/s

Object.assign - multiple values

579K/s

dot notation - multiple values

475K/s

View exact numbers

Test name	Executions per second
✓ dot notation - single value	15,100,701 Ops/sec
Object.assign - single value	3,621,408 Ops/sec
Object.assign - multiple values	578,951 Ops/sec
dot notation - multiple values	474,553 Ops/sec

Script Preparation code:

var target = {};
var alphabet = 'abcdefghijklmnopqrstuvwxyz'.split('');
var source = alphabet.reduce((acc, char) => {
	acc[char] = char;
  return acc;
}, {});

Tests:

Object.assign - single value
Object.assign(target, source['a']);
dot notation - single value
target['a'] = source['a'];
Object.assign - multiple values
Object.assign(target, source);
dot notation - multiple values
Object.keys(source).forEach(elem => target[elem] = source[elem]);