Run results for: Half loop and double iteration ops

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.3 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Loop with N/2 iterations and 2x iteration size	39077.5 Ops/sec
Simple Loop	40851.2 Ops/sec
Reverse While	40919.0 Ops/sec
Reverse While !== 0	41218.1 Ops/sec

Script Preparation code:

var str = 'd sd a SDAS dad sad asd ad SAd sad fgh gfhgjhg fgdjf h;dsfgs dflgk sdljl dfgjdfg lkdfsjgl sdg jdsflg gjdhdjrebfkjsfgnfsd ngkjdfgn dfsng ndfklgndsfkjlgn kjlsdfng jklndfsgljkndsfklgndsfkjlgnfdkjgn sjkflgndfskjlgn dkjlfgnldskjngfdlkjgndsflgn dfskljg nfdgl kdfnsgljkfsdnglkjsdfnglskjdgnsdlfgnsdfjgnsfdlkhj sfdjhl';

Tests:

Loop with N/2 iterations and 2x iteration size
var end = str.length / 2 | 0; var res1 = ''; var res2 = ''; var resA = ''; for (let i = 0; i < end; i++) { res1 += '#' + str[i]; res2 += '#' + str[i + end]; } resA = res1 + res2 + ((str.length % 2) ? '#' + str[str.length-1] : '' ) + '#';
Simple Loop
var length = str.length; var resB = ''; for (let i = 0; i < length; i++) { resB += '#' + str[i]; } resB += '#';
Reverse While
var i = str.length; var resC = ''; while (i--) { resC = str[i] + '#' + resC; } resC = '#' + resC;
Reverse While !== 0
var i = str.length; var resD = ''; while (i-- !== 0) { resD = str[i] + '#' + resD; } resD = '#' + resD;

Run results for: Half loop and double iteration ops

Loop with N/2 iterations and 2x iteration size

Simple Loop

Reverse While

Reverse While !== 0