for vs forEach (v441)

Revision 441 of this benchmark created by pusha on

Preparation HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>

Setup

var i,
    value,
    length,
    values = [],
    sum = 0,
    context = values;
  
  
  for (i = 0; i < 10000; i++) {
    values[i] = Math.random();
  }
  
  function add(val) {
    sum += val;
  }
  
  function customForEach(array, callback) {
    const arrayLength = array.length
    for (var i = 0; i < arrayLength; ++i) {
      callback.call(array, array[i], i, array)
    }
  }
  
  function customForEach2(array, callback) {
    const arrayLength = array.length;
    for (var i = 0; i < arrayLength; ++i) {
      callback(array[i]);
    }
  }

Teardown



            i = 0;
  value = 0;
  length = 0;
  values = [];
  sum = 0;

Test runner

Ready to run.

Testing in
TestOps/sec
forEach
values.forEach(add);
ready
for loop, simple
for (i = 0; i < values.length; i++) {
  sum += values[i];
}
ready
customForEach
customForEach(values, add)
ready
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  sum += values[i];
}
ready
for loop, cached length, callback
length = values.length;
for (i = 0; i < length; i++) {
  add(values[i], i, values);
}
ready
for loop, cached length, callback.call
length = values.length;
for (i = 0; i < length; i++) {
  add.call(context, values[i], i, values);
}
ready
$.each
$.each(values, function(key, value) {
  sum += value;
});
ready
for ... in
for (i in values) {
  sum += values[i];
}
ready
for loop, reverse, decrement condition
for (i = values.length; i--;) {
  sum += values[i];
}
ready
for loop, reverse, pre-decrement
for (i = values.length - 1; i >= 0; --i) {
  sum += values[i];
}
ready
for loop, assignment condition
for (i = 0;
  (value = values[i]) !== undefined; i++) {
  sum += value;
}
ready
for loop, assignment condition, reversed
for (i = values.length - 1;
  (value = values[i]) !== undefined; i--) {
  sum += value;
}
ready
for loop, assignment condition, callback
for (i = 0;
  (value = values[i]) !== undefined; i++) {
  add(value, i, values);
}
ready
for loop, assignment condition, callback.call
for (i = 0;
  (value = values[i]) !== undefined; i++) {
  add.call(context, value, i, values);
}
ready
forEach2
values.forEach(add);
ready
forEach inline
values.forEach(function(val) {
  sum += val;
});
ready
forEach ES6
values.forEach(val = > sum += val);
ready
reduce ES6
sum = values.reduce((a, b) = > a + b);
ready
for loop, cached
length = values.length;
for (i = 0; i < length; i++) {
  sum += values[i];
}
ready
customForEach2
customForEach2(values, add);
ready
for loop, cached length, callback short
length = values.length;
for (i = 0; i < length; i++) {
  add(values[i]);
}
ready

Revisions

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