Run results for: Which is more efficient .replace() or .split().map().join()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

for

3.1M/s

splitmapjoin

1.7M/s

replace

218K/s

View exact numbers

Test name	Executions per second
✓ for	3,100,714 Ops/sec
splitmapjoin	1,658,278 Ops/sec
replace	217,947 Ops/sec

Script Preparation code:

var testString = '052768194390675213483698521470';
function fakeBin(strNums){ 
  return strNums.split("")
                .map(num => num = num < 5 ? 0 : 1)
                .join("")
}
function fakeBin2(x) {
  return x.replace(/\d/g, n => "0000011111"[n])
}
function fakeBin3(word) {
  let result = '';
  for (var i = 0; i < word.length; i++) {
    result += Number(word[i]) < 5 ? 0 : 1;
  }
  return result;
}

Tests:

splitmapjoin
fakeBin(testString)
replace
fakeBin2(testString)
for
fakeBin3(testString)