leftpad test case

Benchmark created on

Preparation HTML

Setup

function leftPad(str, len, ch){
	return new Array(len - str.length).fill(!ch && ch !== 0 ? ' ' : ch).join('') + str
}

function leftPad2 (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;
}

function leftPad3(str, len, ch){
	if (!ch && ch !== 0) ch = ' ';
	return ch.repeat(len - str.length) + str
}

function leftPad4(str, len, ch){
	if (!ch && ch !== 0) ch = ' ';
    return str.padStart(len, ch);
}

Test runner

leftPad('bla', 10000)

leftPad2('bla', 10000)

leftPad3('bla', 10000)

leftPad4('bla', 10000)

Revisions

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• Revision 1: published on