One if's or two

JavaScript performance comparison

Test case created

Preparation code

Benchmark.prototype.setup = function() {
    var keysDown = ['foo', 'bar', '37', 'left', 'right'];
    var sprint = {
      state: 'right'

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Testing in unknown unknown
Test Ops/sec
Both checks
if (37 in keysDown) { //left arrow
  if (sprite.state != 'left') sprite.state = 'left';
Just the one
if (37 in keysDown) { //left arrow
  sprite.state = 'left';

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