CodeKata Kata02 Karate Chop benchmark - http://codekata.com/kata/kata02-karate-chop/

chop-benchmark.js

var chops = {};
var benchmark = false;

// solution 1
chops['indexOf'] = function (needle, haystack) {
  return haystack.indexOf(needle);
};

// put your other solutions here in the same way as above



// testing / benchmarking code below!

var assert = require('assert');
function testChop(chop) {
  assert.equal(-1, chop(3, []));
  assert.equal(-1, chop(3, [1]));
  assert.equal(0,  chop(1, [1]));

  assert.equal(0,  chop(1, [1, 3, 5]));
  assert.equal(1,  chop(3, [1, 3, 5]));
  assert.equal(2,  chop(5, [1, 3, 5]));
  assert.equal(-1, chop(0, [1, 3, 5]));
  assert.equal(-1, chop(2, [1, 3, 5]));
  assert.equal(-1, chop(4, [1, 3, 5]));
  assert.equal(-1, chop(6, [1, 3, 5]));

  assert.equal(0,  chop(1, [1, 3, 5, 7]));
  assert.equal(1,  chop(3, [1, 3, 5, 7]));
  assert.equal(2,  chop(5, [1, 3, 5, 7]));
  assert.equal(3,  chop(7, [1, 3, 5, 7]));
  assert.equal(-1, chop(0, [1, 3, 5, 7]));
  assert.equal(-1, chop(2, [1, 3, 5, 7]));
  assert.equal(-1, chop(4, [1, 3, 5, 7]));
  assert.equal(-1, chop(6, [1, 3, 5, 7]));
  assert.equal(-1, chop(8, [1, 3, 5, 7]));

  return true;
}

for (var key in chops) {
  var success = testChop(chops[key]);
  console.log('Running unit tests on `' + key + '`:', (success === true) ? 'success' : 'FAIL');
  if (success !== true) delete chops[key]; 
}

if (benchmark) {
  var Benchtable = require('benchtable');
  var suite = new Benchtable();

  for (var key in chops) {
    suite.addFunction(key, function() {
      testChop(chops[key]);
    });
  }

  suite.addInput('Chop');

  suite.on('cycle', function(event) {
    console.log(String(event.target));
  });

  suite.on('complete', function() {
    console.log('Fastest is ' + this.filter('fastest').pluck('name'));
    console.log(this.table.toString());
  });

  suite.run({ 'async': true });
}