Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    z = {};
    z.merge = function() {
      return Math.random()
    }
    z.unmerge = function() {
      return Math.random()
    }
    var value = 'merge'
    z.hash = {
      'merge': 'unmerge'
    }
  };
</script>

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z[value]()

z['un' + value]()

z[z.hash[value]]()

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