lengthvsvar

JavaScript performance comparison

Test case created by josh

Preparation code

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

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Testing in unknown unknown
Test Ops/sec
length
if (arr.length === 0) {
 return false;
}

var completed = 0;

for (var i = 0; i < arr.length; i++) {
 if (completed === arr.length) {
  return true;
 }
 completed++;
}
pending…
var
var arl = arr.length;

if (arl === 0) {
 return false;
}

var completed = 0;

for (var i = 0; i < arl; i++) {
 if (completed === arl) {
  return true;
 }
 completed++;
}
pending…

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