Caesar Cipher code

digitalmaster37779 · May 17, 2021, 9:12pm

So I made a program in Javascript that encrypts a message using the Caesar Cipher. Any feedback is appreciated.

Aclixion/Caesar-Cipher/blob/main/caesarCipher.js

// Creates a mapping of the original alphabet to the shifted alphabet based on the key
function createNewAlphabet(key) {
    const alphabet = "abcdefghijklmnopqrstuvwxyz";
    let newAlphabet = {};
    // Goes through each letter and creates a mapping
    for (let i = 0; i < 26; i++) {
        newAlphabet[alphabet[i]] = alphabet[(i + key) % 26]; // Mod 26 to shift the letter back to "a" after it reaches end
    }

    return newAlphabet;
}
// Encrypts message using caesar cipher
function encrypt(message, key = 0) {
    // If message is null, undefined, or empty string, return empty string
    if (!message) {
        return "";
    }
    // message is converted to lowercase for case-insensitivity
    message = message.toLowerCase();
    // Makes a mapping of the alphabet to the shiifted alphabet and initializes encrypted message

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usernamegiapreso · May 18, 2021, 7:43am

I did something quite similar for a JS challenge exercise here on Codeacademy!