Run results for: Object.assign vs spread vs _.extend on big data

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Object.assign

9.5M/s

spread operator

949K/s

_.extend

5K/s

View exact numbers

HTML Preparation code:

<script src="https://underscorejs.org/underscore-min.js"></script>

Script Preparation code:

var params = Array(10000).fill().map((_, i) => i).reduce((acc, v) => {
  console.log(v)
  acc[v] = {vafsd: v};
  return acc
}, {});

Tests: