forEach benchmark

bench.js

var x = [];
// one million elements
for (var i = 0; i < 1000000; i++) {
  x.push(i);
}

function testFor(x) {
  console.time('benchmark');
  for (var i = 0; i < x.length; i++) {
    x[i];
  }
  console.timeEnd('benchmark');
};

function testForEach(x) {
  console.time('benchmark');
  x.forEach(function(el) {
    el;
  });
  console.timeEnd('benchmark');
};

testFor(x);
benchmark: 1.484ms
testFor(x);
benchmark: 1.644ms
testFor(x);
benchmark: 1.481ms
testFor(x);
benchmark: 1.478ms
testFor(x);
benchmark: 1.488ms

testForEach(x);
benchmark: 63.130ms
testForEach(x);
benchmark: 60.199ms
testForEach(x);
benchmark: 67.509ms
testForEach(x);
benchmark: 57.232ms
testForEach(x);
benchmark: 55.450ms