Run results for: IndexOfAll - Reduce vs For

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Browser: Chrome 68

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Reduce	55381.7 Ops/sec
For	33592.0 Ops/sec

HTML Preparation code:

<html>
  <head>
  	<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script>
  </head>
  <body>
  </body>
</html>

Script Preparation code:

var xpath = "sdf[ewr[dasdfdsaf]asdfasdf]gh[asdfasdf]adsdasd[asdasd]asdasdsa[asd[[[[[asdasdasd]]]]]asd]"

Tests:

Reduce
var result = _.reduce(xpath, function(accumulator, element, index) { if (element === '[') { accumulator.push({start: index}); } if (element === ']') { _.set(_.findLast(accumulator, (obj) => !obj.end), "end", index); } return accumulator; }, []);
For
var predicateMarkStack = []; var predicateMarkIndexRange = []; for (var i = 0; i < xpath.length; i++) { if (xpath.charAt(i) === "[") { predicateMarkStack.push(i); } if (xpath.charAt(i) === "]") { var index = predicateMarkStack.pop(); // if (predicateMarkStack.length === 0) { predicateMarkIndexRange.push({init: index, end: i}); // } } }