Preview:
module.exports = leftpad;
​
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;
}
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