Ejercicio deletreador en JavaScript

deletreador.js

const getLetter = (word) => {
  return word[0]
}

const createSinglePhrase = (word) => {
  return `${getLetter(word)} is for ${word}`
}

const createPhrase = (word, lst) => {
  return lst.length === 1 ?
    `${createSinglePhrase(word)}, and` :
    `${createSinglePhrase(word)},`
}

function deletreador(words) {
    const [x, ...xs] = words
    return words.length === 0 ? '' :
    words.length === 1 ?
    createSinglePhrase(words[0]) :
    `${createPhrase(x, xs)} ${deletreador(xs)}`
}

const [_head, _second, ...words] = process.argv
console.log(deletreador(words))