Code Wars: Rot13 (5 kyu)

Link to code challenge
function rot13(message){ let newString = ""; for (let char of message) { if ( char.match(/[a-z]/i) === null ) newString += char; else if ( char.charCodeAt() > 77 && char.charCodeAt() < 91 ) { //subtr 91 instead of 90 as going from end of character set to beginning counts as 1 step up let newChar1 = (char.charCodeAt() + 13 - 91) + 65; newString += String.fromCharCode(newChar1); } else if ( char.charCodeAt() > 109 && char.charCodeAt() < 123 ) { let newChar2 = (char.charCodeAt() + 13 - 123) + 97; newString += String.fromCharCode(newChar2); } else { let newChar3 = char.charCodeAt() + 13; newString += String.fromCharCode(newChar3); } } return newString; }

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