(Article) You should aim to forget how your code works

decodeMorseCleverComments.js

const decodeMorse = (morseCode) => {
  return morseCode
    .trim()
    // Each Morse code words are split by 3 spaces, and each letters are split by 1 space.
    // The order of the two sequences below is important. We always check for 2 spaces first
    // and then for one space. This allows to split all letters properly because 2 spaces
    // will not match one space. If we do hit a 3 spaces sequence, we will first split on
    // the 2 spaces, which will leave us with a right substring starting with 1 space.
    // This will then be split again because of the trailing space. The 3 spaces will then
    // result in 3 substrings. The expected left substring letter, an empty string, and the
    // expected right substring letter.
    // Ex. '..-. --- ---   -... .- .-.' will result in 
    // ['..-.', '---', '---', '', '-...', '.-', '.-.']
    .split(/  | /)
    // Based on the above split, each Morse letter will be translated directly from the
    // dictionary. The empty strings will result in undefineds, thus the right side of the
    // OR will be evaluated and return a space.
    .map( (code) => MORSE_CODE[code] || ' ')
    .join('');
}