The loops

JavaScript performance comparison

Revision 15 of this test case created

Info

Is the "reverse while" really faster than a normal for loop? And if yes, how much?

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var iterations2 = 100,
        a = 0,
        i, iterations;
  };
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
while, ne, subtraction
 
i = iterations2;
while (i !== 0) {
  a = a + 1;
  a = a - 1;
  i--;
}
 
 pending…
while, ne, addition
 
i = 0;
while (i !== iterations2) {
  a = a + 1;
  a = a - 1;
  i++;
}
 pending…
for-loop, lt, addition
 
for(i=0; i < iterations2; i++) {
    a = a + 1;
    a = a - 1;
}
 pending…
for-loop, ne, addition
 
for(i=0; i !== iterations2; i++) {
    a = a + 1;
    a = a - 1;
}
 pending…
for-loop, gt, subtraction
 
for(i=iterations2; i > 0; i--) {
    a = a + 1;
    a = a - 1;
}
 pending…
for-loop, ne, subtraction
 
for(i=iterations2; i !== 0; i--) {
    a = a + 1;
    a = a - 1;
}
 pending…
while, gt, subtraction
 
i = iterations2;
while (i > 0) {
  a = a + 1;
  a = a - 1;
  i--;
}
 
 pending…
while, lt, addition
 
i = 0;
while (i < iterations2) {
  a = a + 1;
  a = a - 1;
  i++;
}
 
 pending…

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