Benchmarking merging object

assign-vs-destructuring.js

const Benchmark = require('benchmark')
const _ = require('lodash');

const suite = new Benchmark.Suite

const obj1 = {
  nested: {
    object: {
      value: 'string'
    }
  },
  value: 42
};

const obj2 = {
  something: 'foobar',
  value: 21,
  detsen: {
    tcejbo: {
      eulav: 'gnirts'
    }
  }
};

suite
.add('Object.assign', () => {
  const res = Object.assign({}, obj1, obj2);
})
.add('Destructuring', () => {
  const res = { ...obj1, ...obj2 };
})
.add('lodash.merge', () => {
  const res = _.merge({}, obj1, obj2);
})
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').map('name'));
})
.run();

results.txt

$ node --version
v12.13.0
$ node nodejs/assign-vs-destructuring.js 
  Object.assign x 9,002,988 ops/sec ±4.35% (84 runs sampled)
  Destructuring x 13,389,910 ops/sec ±0.96% (92 runs sampled)
  lodash.merge x 240,255 ops/sec ±1.12% (91 runs sampled)
 Fastest is Destructuring