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The idea behind this is that we switch the codepath that we're running only very rarely. Should we make the actual codepath selection every time we loop or only at the time we actually change it?

(Test 1 implicates that we use (at the time of change) if-else to change the module into some other module which also has the func property.)

This test tries to see if which code selection strategy has the bigger penalty.

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var counterTestModule = (function() {
        var value =0;
        
        var func = function() {
            value = value + 1;
        }
        
        var getValue = function() {
            return value;
        } 
        
        var reset = function() {
            value = 0;
        }
        
        return {
            func: func,
            getVal: getValue,
            reset: reset
        }
    })();
    
    var test1 = 'PLUSONE';
    var test2 = 'PLUSTWO';
    var test3 = 'PLUSTHREE';
    var value = 0;
  };

  Benchmark.prototype.teardown = function() {
    value = 0;
  };
</script>

Test runner

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counterTestModule.func();
 

if (test1==='PLUSONE') {
    value = value + 1;
} else if (test1==='PLUSTWO') {
    value = value + 2;
} else if (test1==='PLUSTHREE') {
    value = value + 3;
}

if (test2==='PLUSONE') {
    value = value + 1;
} else if (test2==='PLUSTWO') {
    value = value + 2;
} else if (test2==='PLUSTHREE') {
    value = value + 3;
}

if (test3==='PLUSONE') {
    value = value + 1;
} else if (test3==='PLUSTWO') {
    value = value + 2;
} else if (test3==='PLUSTHREE') {
    value = value + 3;
}

if (test1==='PLUSONE') {
    value = value + 3;
} else if (test1==='PLUSTWO') {
    value = value + 2;
} else if (test1==='PLUSTHREE') {
    value = value + 1;
}

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