Preparation code

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.3/underscore-min.js">
</script>
<script>
  Benchmark.prototype.setup = function() {
    negativeDiv = function(chanceOfNegative) {
      if (Math.random() > 1 / (chanceOfNegative || 2)) {
        return 1
      } else {
        return -1
      }
    }
    
    negativeMod = function(chanceOfNegative) {
      if (_.random(100) % (chanceOfNegative || 2) !== 0) {
        return 1
      } else {
        return -1
      }
    }
  };
</script>

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_(10).times(function(n) { negativeDiv(n) })
 

_(10).times(function(n) { negativeMod(n) })
 

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