Ensure 2 digit numbers

JavaScript performance comparison

Test case created by Josh Rhoades

Info

Quick test for ensuring numnbers (specifically times for countdowns) are always formatted with 2 digits. Slice vs. the usual if n < 10 checks.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var aTest = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];
};
</script>

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Testing in unknown unknown
Test Ops/sec
Old
function formatOld(aTest) {
        var i = 0, l = aTest.length, theTest;
        for (;i<l;i++) {
theTest = aTest[i];
                if (theTest < 10) {
                        theTest = '0' + theTest;
                }
        }
}
pending…
New
function formatNew(aTest) {
        var i = 0, l = aTest.length, theTest;
        for (;i<l;i++) {
theTest = aTest[i];
                theTest = ('0' + theTest).slice(-2);
        }
}
pending…

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