Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var string0 = "I AM A STRING";
    var string1 = "I AM ALSO A STRING";
    var string2 = "I AM NO DIFFERENT THAN THE OTHERS";
    var string3 = "I AM STARTING TO RUN OUT OF CLEVER THINGS TO SAY";
    var string4 = "5 OF THESE SHOULD BE GOOD";
  };
</script>

Test runner

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var output0 = [string0, string1].join("");
 

var output0 = string0 + string1;
 

var output0 = [string0, string1, string2, string3, string4].join("");
 

var output0 = string0 + string1 + string2 + string3 + string4;

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