Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var types = {
      string: function(str) {
       return typeof str === 'string';
      }
    }
    var typeLookup = function(t, str) {
       types[t](str);
    }
    
    var typesObj = {
       string: function(str) {
         return str.name === 'String'   
    }
    }
    var objType = function(t, str) {
       typesObj[t](str);
    }
  };
</script>

Test runner

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typeLookup('hi')

objType('hi')

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