iterator perfs

Benchmark created on

Setup

var arr = [];
  for (var i = 0; i < 1000; i++) {
    arr[i] = Math.random();
  }

Test runner

Ready to run.

Testing in
TestOps/sec
not cached
for (var i = 0; i < arr.length; i++) {
  arr[i] *= 2;
}
ready
u wot m8
var len = 2;
len *= arr.length;
len -= len / 2;
for (var i = 0; i < len; i++) {
  arr[i] *= 2;
}
ready
while loop
var len = arr.length;
while (len--) {
  arr[len] *= 2;
}
ready
do-while
var len = arr.length;
do {
  arr[len] *= 2;
} while (len--);
ready
Prefix increment
var i = 0;
var iLen = arr.length;
for (; i < iLen; ++i) {
  arr[i] *= 2;
}
ready
Prefix + cached
for (var i = 0, len = arr.length; i < len; ++i) {
  arr[i] *= 2;
}
ready
Array Map
arr.map(function(el) {
  return el * 2;
});
ready
Standard loop
for (var i = 0; i < arr.length; i++) {
  arr[-i] *= 2;
}
ready
for...in
for (let i in arr) {
  arr[i] *= 2;
}
ready
for...of
for (let value of arr) {
  value *= 2;
}
ready

Revisions

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