.gitignore

# Logs
logs
*.log
npm-debug.log*

# Runtime data
pids
*.pid
*.seed

# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov

# Coverage directory used by tools like istanbul
coverage

# nyc test coverage
.nyc_output

# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
.grunt

# node-waf configuration
.lock-wscript

# Compiled binary addons (http://nodejs.org/api/addons.html)
build/Release

# Dependency directories
node_modules
jspm_packages

# Optional npm cache directory
.npm

# Optional REPL history
.node_repl_history

assign.js

'use strict'
const Benchmark = require('benchmark')
const suite = new Benchmark.Suite

global._ = require('lodash')

const params = {
    setup: () => {
        const data = []

        for (let i = 100; i >= 0; i--) {
            const obj = {}
            obj[i] = 'a'
            obj[i*1000] = 'b'
            obj[i*10000] = 'c'
            obj[i*100000] = 'd'
            data.push(obj)
        }
    },
    strict: true,
}

suite
    .add('Native assign + apply', function() {
        Object.assign.apply(Object, data)
    }, params)
    .add('Native expand assign', function() {
        Object.assign(...data)
    }, params)
    .add('LoDash reduce assign', function() {
        _.reduce(data, _.extend)
    }, params)
    .add('LoDash expand assign', function() {
        _.assign({}, ...data)
    }, params)
    .on('cycle', function(event) {
      console.log(String(event.target));
    })
    .on('complete', function() {
      console.log('Fastest is ' + this.filter('fastest').map('name'));
    })
    // run async
    .run({async: true})

package.json

{
  "name": "benchmarks",
  "version": "0.0.0",
  "main": "index.js",
  "author": "Jan Vlnas",
  "license": "MIT",
  "dependencies": {
    "benchmark": "^2.1.3",
    "lodash": "^4.17.4",
    "microtime": "^2.1.2"
  }
}

yarn.lock

# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
# yarn lockfile v1


benchmark@^2.1.3:
  version "2.1.3"
  resolved "https://registry.yarnpkg.com/benchmark/-/benchmark-2.1.3.tgz#e10e40e4d53d0e1c9d77a834fde593994dca7f0c"
  dependencies:
    lodash "^4.17.3"
    platform "^1.3.3"

bindings@1.2.x:
  version "1.2.1"
  resolved "https://registry.yarnpkg.com/bindings/-/bindings-1.2.1.tgz#14ad6113812d2d37d72e67b4cacb4bb726505f11"

lodash@^4.17.3, lodash@^4.17.4:
  version "4.17.4"
  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"

microtime@^2.1.2:
  version "2.1.2"
  resolved "https://registry.yarnpkg.com/microtime/-/microtime-2.1.2.tgz#9c955d0781961ab13a1b6f9a82b080f5d7ecd83b"
  dependencies:
    bindings "1.2.x"
    nan "2.4.x"

nan@2.4.x:
  version "2.4.0"
  resolved "https://registry.yarnpkg.com/nan/-/nan-2.4.0.tgz#fb3c59d45fe4effe215f0b890f8adf6eb32d2232"

platform@^1.3.3:
  version "1.3.3"
  resolved "https://registry.yarnpkg.com/platform/-/platform-1.3.3.tgz#646c77011899870b6a0903e75e997e8e51da7461"

Native assign + apply x 8,811 ops/sec ±1.16% (90 runs sampled)
Native expand assign x 7,830 ops/sec ±1.05% (93 runs sampled)
LoDash reduce assign x 6,179 ops/sec ±1.40% (86 runs sampled)
LoDash expand assign x 5,599 ops/sec ±0.73% (94 runs sampled)
Fastest is Native assign + apply