I also wrote a JavaScript padding function, except in one line

right-pad.js

/** 
 * Right Pad 
 * 
 * str - the string to pad 
 * chr - the character to use as padding 
 * n - the desired string length 
 */
function rpad(str, chr, n)
{
  return ((str+='').length < n && chr) ? rpad(str + chr, chr, n) : str;
}

me too

 let rpad = (input, pad, length) => input + pad.repeat(length - input.length);

Okay, I guess you win with your newer syntax... Fair enough.

Although, that only works when input, and pad are strings.