Benchmark various methods to copy array in ES2015

benchmark-copy-array.js

import {Suite} from 'benchmark';

const suite = new Suite();

suite
  .add('Array Spread Operator', () => {
    const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
    const b = [...a];
  })
  .add('Array.from()', () => {
    const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
    const b = Array.from(a);
  })
  .add('arr.slice()', () => {
    const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
    const b = a.slice();
  })
  .add('arr.concat()', () => {
    const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
    const b = a.concat();
  })
  .on('cycle', (event) => {
    console.log(String(event.target));
  })
  .on('complete', () => {
    console.log(`Winner: ${suite.filter('fastest').map('name')}`);
  })
  .run({async: true});

Results:

Array Spread Operator x 420,984 ops/sec ±2.48% (81 runs sampled)
Array.from() x 948,784 ops/sec ±2.36% (81 runs sampled)
arr.slice() x 6,755,822 ops/sec ±3.02% (86 runs sampled)
arr.concat() x 5,630,838 ops/sec ±2.32% (90 runs sampled)
Winner: arr.slice()

OS: Windows 10
Node: 5.11.0