Run results for: forEach vs for len vs for in vs for of vs babel for of loops

created based off of an archived jsperf benchmark: http://web.archive.org/web/20191008221700/https://jsperf.com/foreach-vs-for-loop-vs-for-in-vs-for-of-vs-babel-for-of

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.3.1

Device Platform: Mobile

Date tested: 9 months ago

Test name	Executions per second
forEach	3206223.2 Ops/sec
for	16835296.0 Ops/sec
for optimized	17101716.0 Ops/sec
reduce	775409.4 Ops/sec
while	14938386.0 Ops/sec
for in	330154.6 Ops/sec
for of	503598.7 Ops/sec
for of babel	12747.7 Ops/sec

HTML Preparation code:

<script>
    Benchmark.prototype.setup = function() {
        var testData = [];
        for (var i = 0; i < 100; i++) {
            testData.push(i);
        }
    };
</script>

Tests:

forEach
var res = 0; testData.forEach(function(x) { res += x; });
for
var res = 0; for (var i = 0; i < testData.length; i++) { res += testData[i]; }
for optimized
var res = 0; for (var i = 0, len = testData.length; i < len; i++) { res += testData[i]; }
reduce
var res = testData.reduce(function(sum, x) { return sum + x; }, 0);
while
var res = 0; var i = testData.length; while (i--) { res += testData[i]; }
for in
var res = 0; for (var data in testData) { res += testData[i]; }
for of
var res = 0; for (var data of testData) { res += testData[i]; }
for of babel
var res = 0; var _iteratorNormalCompletion = true; var _didIteratorError = false; var _iteratorError = undefined; try { for (var _iterator = testData[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) { var value = _step.value; console.log(value); } } catch (err) { _didIteratorError = true; _iteratorError = err; } finally { try { res += testData[i]; if (!_iteratorNormalCompletion && _iterator.return) { _iterator.return(); } } finally { if (_didIteratorError) { throw _iteratorError; } } }

Run results for: forEach vs for len vs for in vs for of vs babel for of loops

created based off of an archived jsperf benchmark: http://web.archive.org/web/20191008221700/https://jsperf.com/foreach-vs-for-loop-vs-for-in-vs-for-of-vs-babel-for-of

forEach

for

for optimized

reduce

while

for in

for of

for of babel