Caesars Cipher: bug with characters

Back End Help
#1

My code seems to have a bug where when I put certain letters such as “E” it bugs out and makes it a letter behind where it should be. Any suggestions? (I am not 100% done with the code, so I haven’t combined the characters.)

Your code so far


function rot13(str) { // LBH QVQ VG!
  str = str.split('');
  let n;
  for(let i = 0; i => str.length; i++) {
    n = str[i].charCodeAt(0);
    n = n + 12;
    if (n > 90) {
      n = (n - 90) + 65;
    }
    console.log(String.fromCharCode(n))
    str[i] = String.fromCharCode(n);
    
  }
  return str;
}

// Change the inputs below to test
rot13("SERR PBQR PNZC");

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Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/javascript-algorithms-and-data-structures-projects/caesars-cipher

#2

Also, most letters are where they should be. It is supposed to shift 13 characters, but I only have a 12 because it made most of them work.

#3

update: figured it out, but now I have a different problem

#4

gods job in figuring it out yourself!

if you need help with the different problem, you will also need to post the new code

#5 
function rot13(str) { // LBH QVQ VG!
  str = str.split('');
  let n;
  for(let i = 0; i => str.length; i++) {
    n = str[i].charCodeAt(0);
    if (n === 32) {
      n = n - 13;
    }
    n = n + 13;
    if (n > 90) {
      n = (n - 90) + 64;
    }
    str[i] = String.fromCharCode(n);
    console.log(str[i])
  }
  str = str.join('');
  return str;
}

// Change the inputs below to test
rot13("SERR PBQR PNZC");

I figured out that problem, but now it says that undefined is not an object (evaluating ‘str[i].charCodeAt’), even though when I use console.log it works perfectly.

#6

what is str[str.length]?

#7

str[str.length] comes up as an empty string.

#8

don’t you see any issue there?
what’s the index of the last character in your string?

also, now that I see it better, that is wrong syntax… i => str.length is wrong syntax - not just bad logic

#9

yeah, that’s probably a problem. But if I revise the program so the for loop is as follows:

for(let i = 0; i => str.length - 1; i++) {
    n = str[i].charCodeAt(0);
    if (n === 32) {
      n = n - 13;
    }
    n = n + 13;
    if (n > 90) {
      n = (n - 90) + 64;
    }
    str[i] = String.fromCharCode(n);
  }

the same error message appears when I run the code.

#10

you probably missed this part

#11

yes I did miss that part lol, ill try it

#12

that worked, thanks!