Recursive Algo for word wrapping, given a fixed div width.

formatWords.js

/* eslint-disable */
let result = '';
let test = "tobiah is happy eandhelovestocode fordaysanddaysanddays";
[
  'tobiah',
  'is',
  'happy',
  'eandhelovestocode',
  'fordaysanddaysanddays'
]

[ 'tobiah is happy',
  'eandhelovestocode',
  'fordaysanddaysanddays' ]

const formatWords = (i, oldWords, newWords = []) => {
  if (i === oldWords.length) return;

  const lastWord = newWords[newWords.length - 1] || '';
  const nextWord = oldWords[i += 1] || '';

  if ((lastWord.length + nextWord.length + 1) < 19) {
    newWords.push(`${nextWord} `);
  } else {
    newWords.pop();
    newWords.push(`${lastWord}\n`);
    newWords.push(nextWord);
  }
  formatWords(i, oldWords, newWords);
  return newWords.join('');
}

result = formatWords(-1, test.split(' '));
console.log(result)