calling letters add beyond the answer. Caesar cipher

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Thu Mar 23 2023 12:34:44 GMT+0000 (Coordinated Universal Time)

function rot13(message){
  //your code here
  const lowercase= ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];
  const uppercase= ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']
  
  const answer = []
  
for (i=0; i<message.length; i++) {
  
  let arr 
  
  if (message[i]===message[i].toLowerCase()) {
    arr=lowercase
  } else { arr=uppercase }
  let pos = arr.indexOf(message[i])
  if (pos=== -1) {
    answer.push(message[i])
    continue
  }
  pos += 13
  pos = pos % 26
  answer.push(arr[pos])
}
  
  return answer.join('')
}

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@AlanaBF

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calling letters add beyond the answer. Caesar cipher

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