freeCodeCamp Challenge Guide: Comma quibbling

Guide
#1

Comma quibbling

Solutions

Solution 1 (Click to Show/Hide) 
function quibble(words) {
  let newWords = [];
  const len = words.length;
  if (len === 1) {
    // For exactly one word, just copy into the new array. (Do nothing)
    newWords = [...words];
  } else if (len > 1) {
    if (len > 2) {
      // Add commas between all but last two words
      newWords = words.slice(0, -2).map(word => word + ',');
    }
    // Add and 'and' between the last two words
    newWords.push(words.slice(len - 2, len - 1))
    newWords.push(" and ");
    newWords.push(words.slice(len - 1));
  }
  newWords.push('}') // Add a trailing bracket
  newWords.unshift('{') // Add a leading bracket

  return newWords.join(''); // Join all the elements into a string and return
}

console.log(quibble([]));
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