coins.js

const COINS = {
    25: 'QUARTER',
    10: 'DIME',
    5: 'NICKEL',
    1: 'PENNY'
};

const COIN_VALUES = Object.keys(COINS).sort((a, b) => b - a);

class LL {
  v = null;
  n = null;

  constructor(v, n) {
    this.v = v;
    this.n = n;
  }
}

const printList = ll => {
  const internal = ll => {
    if (ll === null)
      return '';

    return `${ll.v}, ${internal(ll.n)}`
  };

  console.log(internal(ll));
}

const makeChange = cents => {
  if (cents === 0)
    return null;

  for (const val of COIN_VALUES)
    if (val <= cents)
      return new LL(val, makeChange(cents - val));
};

printList(makeChange(73));