Extract substrings of predetermined a length, along with any remainder.

cordwood.js

/**
 * String.cordwood
 * 
 * Add a String prototype method to split string into an array of 
 * substrings of a given length, along with any remainder.
 *
 * Example usage:
 * let paragraph = 'The quick brown fox jumps over the lazy dog. It barked.';
 * let stack = paragraph.cordwood(10) 
 * console.log(stack)
 * // ["The quick ", "brown fox ", "jumps over", " the lazy ", "dog. It ba", "rked."]
 *
 * @param cordlen the length of pieces to chop the string into
 * @returns Array all the equal-sized pieces of the string, and one optional remainder piece shorter than cordlen
 */
if (!String.prototype.cordwood) {
  String.prototype.cordwood = function(cordlen) {
  if (cordlen === undefined || cordlen > this.length) {
    cordlen = this.length;
  }
  var yardstick = new RegExp(`.{${cordlen}}`, 'g');
  var pieces = this.match(yardstick);
  var accumulated = (pieces.length * cordlen);
  var modulo = this.length % accumulated;
  if (modulo) pieces.push(this.slice(accumulated));	
  return pieces;
 };
}

Add |.+ to your regex and it'll match the end as well.

"covfefe".match(/..|.+/g)
[ 'co', 'vf', 'ef', 'e' ]

if (!String.prototype.cordwood) {
  String.prototype.cordwood = function(cordlen) {
    if (!cordlen || cordlen < 0) cordlen = this.length;
    const yardstick = new RegExp(`.{${cordlen}}|.+`, 'g');
    return this.match(yardstick);
 };
}

Nice one, @dr-skot!