Benchmarking array iteration with Node.js

array-benchmark.js

const Benchmark = require('benchmark')

const suite = new Benchmark.Suite

const array = [];

for (let i = 0; i < 1000; i++) {
  array.push(i);
}

suite
.add('for (let i)', () => {
  for (let i = 0; i < array.length; ++i) {
    const item = array[i];

    const foobar = item * 2;
  }
})
.add('for (const of)', () => {
  for (const item of array) {
    const foobar = item * 2;
  }
})
.add('foreach', () => {
  array.forEach(item => {
    const foobar = item * 2;
  });
})
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').map('name'));
})
.run();