leftpad

Benchmark created on

Setup

function leftpad (str, len, ch) {
  str = String(str);
  var i = -1;
  if (!ch && ch !== 0) ch = ' ';
  len = len - str.length;
  while (++i < len) {
    str = ch + str;
  }
  return str;
}

const leftpad2 = (str, len, ch = ' ') => (`${ch.repeat(Math.max(0, len - str.length))}${str}`)
 
const base = "nintendo is a great company"
const cases = [1,50,500,5000]

Test runner

Ready to run.

Testing in
TestOps/sec
theirs
cases.forEach(c => leftpad(base, c))
ready
ours
cases.forEach(c => leftpad(base, c))
ready

Revisions

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