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Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var literal = function literal(a) { var sum = 0; for (var i = 0; i < 500; ++i) { sum += Math.random() * a; } return sum; }
    
    var sBody = "var sum = 0; for (var i = 0; i < 500; ++i) { sum += Math.random() * a; } return sum;";
    
    var meta = new Function("a", sBody);
    
    var metaMetaMaker = function(sName, sArgs, sBody) {
        return new Function("return function " + sName + "(" + sArgs + ") {" + sBody + "}")();
    }
    
    var metaMeta = metaMetaMaker("literal", "a", sBody);
    
    var evaled;
    eval("evaled = " + literal.toString());
    
    var x;
  };
</script>

Test runner

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x = literal(5);

x = meta(5);

x = metaMeta(5);

x = evaled(5);

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