Decoderen

console.log('Time to crack the code! 🔓')

console.log('Encode: forward ➡️')
console.log('Decode: backward ⬅️')

let n = 'd'.charCodeAt(0)
console.log('d back by 3:', String.fromCharCode(n - 3))

let key = 3
console.log('The secret key is:', key)

let secret = 'kh'
let key = 3
for (let i = 0; i < secret.length; i++) {
  console.log(String.fromCharCode(secret.charCodeAt(i) - key))
}

let secret = 'kh'
let key = 3
let real = ''
for (let i = 0; i < secret.length; i++) {
  real += String.fromCharCode(secret.charCodeAt(i) - key)
}
console.log('Real message:', real)

let secret = 'khoor'
let key = 3
let real = ''
for (let i = 0; i < secret.length; i++) {
  real += String.fromCharCode(secret.charCodeAt(i) - key)
}
console.log('Decoded:', real)

function decode(secret, key) {
  let out = ''
  for (let i = 0; i < secret.length; i++) {
    out += String.fromCharCode(secret.charCodeAt(i) - key)
  }
  return out
}
console.log(decode('ecv', 2))

function shiftAll(msg, k) {
  let out = ''
  for (let i = 0; i < msg.length; i++) out += String.fromCharCode(msg.charCodeAt(i) + k)
  return out
}
let secret = shiftAll('hi', 3)
let back = shiftAll(secret, -3)
console.log('Secret:', secret, 'Back:', back)

function decode(s, k) {
  let out = ''
  for (let i = 0; i < s.length; i++) out += String.fromCharCode(s.charCodeAt(i) - k)
  return out
}
console.log('Right key:', decode('khoor', 3))
console.log('Wrong key:', decode('khoor', 1))

function decode(s, k) {
  let out = ''
  for (let i = 0; i < s.length; i++) out += String.fromCharCode(s.charCodeAt(i) - k)
  return out
}
console.log('Secret: phhw ph')
console.log('Real:', decode('phhw ph', 3))

console.log('Secret Code Maker: COMPLETE! 🌟🏆')