Run results for: String looping vs split

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36

Browser: Chrome 81

Operating system: Mac OS X 10.15.4

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
for loop	245616.0 Ops/sec
Array.prototype.reduce.call	393825.2 Ops/sec
Array.prototype.reduce.apply	389652.3 Ops/sec
Array.prototype.forEach	386015.7 Ops/sec
.split.reduce	2873768.8 Ops/sec
.split.forEach	2364803.5 Ops/sec

Script Preparation code:

var digits = Math.floor(Number.MAX_SAFE_INTEGER * Math.random()).toString() 
	+ Math.floor(Number.MAX_SAFE_INTEGER * Math.random()).toString();

Tests:

for loop
let sum = 0; for (let i = 0; i < digits.length; ++i) { sum += +digits[i]; }
Array.prototype.reduce.call
let sum = 0; sum = Array.prototype.reduce.call(digits, (prev, curr) => prev + +curr, 0);
Array.prototype.reduce.apply
let sum = 0; sum = Array.prototype.reduce.apply(digits, [(prev, curr) => prev + +curr, 0]);
Array.prototype.forEach
let sum = 0; Array.prototype.forEach.apply(digits, [(i) => sum += +i]);
.split.reduce
let sum = 0; sum = digits.split('').reduce((prev, curr) => prev + +curr, 0);
.split.forEach
let sum = 0; digits.split('').forEach((i) => sum += +i);