99bottlesofbeer.js

function verses(bottles) {
  const count = (b, cap) => `${b || `${cap ? 'N' : 'n'}o more`} bottle${b == 1 ? '' : 's'}`;

  return [...new Array(bottles + 1)].map((v, i) => bottles - i).map(b => [
    `${count(b, true)} of beer on the wall, ${count(b)} of beer.`,
    b > 0
      ? `Take one down and pass it around, ${count(b - 1)} of beer on the wall.`
      : `Go to the store and buy some more, ${count(bottles)} of beer on the wall.`
  ]);
}

const container = document.createElement('pre');
container.innerText = verses(99).map(verse => verse.join('\n')).join('\n\n');
document.body.appendChild(container);