substring vs array

JavaScript performance comparison

Test case created by Anton Ignatov

Preparation code

<script>
var baseArr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20],
arr = [5, 15, 1, 18],
str = '05150118';
</script>

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Testing in unknown unknown
Test Ops/sec
array
for (var i = 0; i < arr.length; i++) {
baseArr[arr[i]];
}
pending…
string
var ot = 0,
    t = 1;

for (;ot < str.length;) {
    t = str.substr(ot, 2);
    ot += 2;
    baseArr[parseInt(t, 10)];
}
pending…

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