Caesars Cipher Better Solution Request

Caesars Cipher Better Solution Request
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Here is my solution but I felt like I cheated to quickly ignore the special characters.
Please give me some advise on how to improve my solution and write better code.
What I gone through was reading the methods (charCodeAt() &fromCharCode()) then though about what I learned from previous lessons to find a solution.
I thought I should turn the Characters into uni-code(numbers) then turn them back to Characters after I add 13 to each one of them since the rule of CC was to shift 13 places for each of the alphabets.
First Problem I encountered was to figure out the actual numerical equivalent of the alphabets.
After that I realize I can’t simply shift alphabets by adding so I hard coded stuff to find where to subtract 13 to get the right uni-code number.
Finally I got it but I felt like I am not thinking like a good programmer.
Please throw anything at me which you consider good practice in approaching problems such as this one.

Thank you


Instead of checking for specific special characters, you could check if each character is within the alphabet range. That way, everything that’s not a letter is unaffected by the cypher, and you don’t need to worry about every special character.

Also, this is a nitpick, but you can reuse i for each for statement; it is only nested for statements that need different variable names.