Message encoder: Morse, binary and hex

morse_binary_hex_encoding.js

const encode = msg => {
  const abc = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  const morsecode =[
    '.-', '-...', '-.-.', '-..', '.', '..-.', '--.', '....',
    '..', '.---', '-.-', '.-..', '--', '-.', '---', '.--.',
    '--.-', '.-.', '...', '-', '..-', '...-', '.--', '-..-',
    '-.--', '--..'
  ]
  const words = msg.toUpperCase().split(' ')
  
  const encoder = w => w.split('').map(l => {
    const idx = abc.indexOf(l)
    if (idx === -1) throw new Error("Invalid characters in message")
    return morsecode[idx]
  })

  const encoded = words.map(encoder)
  const chunk = (arr, size) =>
    Array.from({length: Math.ceil(arr.length / size)}, (v, i) => arr.slice(i * size, i * size + size))
  const bitBuffer = []

  for (word of encoded) {
    const wordBuffer = []
    for (letter of word) {
      const beeps = []
      for (char of letter.split('')) {
        if (char === '.') beeps.push('1')
        else beeps.push('111')
      }
      wordBuffer.push(beeps.join('0'))
    }
    bitBuffer.push(wordBuffer.join('00'))
  }

  const binaryStr = bitBuffer.join('000')

  const toHex = chunk(binaryStr, 8).map(b => {
    const byte = b.length == 8 ? b : b + Array(9 - b.length).join("0")
    return parseInt(byte, 2).toString(16)
  })

  return toHex.join('')
}