function benchmark(Benchmark) {
  var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
  return new Benchmark.Suite()
    .add('Array#slice', function () {
      arr.slice();
    })
    .add('Array#concat', function () {
      arr.concat();
    })
    .add('Array#push with spread operator', function () {
      [].push(...arr);
    })
    .add('Array#push with apply', function () {
      [].push.apply([], arr);
    })
    .add('Array#concat self', function () {
      [].concat(arr);
    })
    .add('for loop', function () {
      var arr2 = [];
      for (var i = 0; i < arr.length; i++) {
        arr2[i] = arr[i];
      }
    })
    .add('polyfill', function () {
      concat([], arr);
    });

  function concat(target, source) {
    for (var i = 0, offset = target.length, len = source.length; i < len; ++i) {
      target[i + offset] = source[i];
    }
    return target;
  }
}