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caesarCipher javascript Code Snippet in 2023

algorithmstringbeginner

Last Updated: 4 February 2023

Encrypts or decrypts a given string using the Caesar cipher.

  • Use the modulo (%) operator and the ternary operator (?) to calculate the correct encryption/decryption key.
  • Use the spread operator (...) and Array.prototype.map() to iterate over the letters of the given string.
  • Use String.prototype.charCodeAt() and String.fromCharCode() to convert each letter appropriately, ignoring special characters, spaces etc.
  • Use Array.prototype.join() to combine all the letters into a string.
  • Pass true to the last parameter, decrypt, to decrypt an encrypted string.
const caesarCipher = (str, shift, decrypt = false) => { const s = decrypt ? (26 - shift) % 26 : shift; const n = s > 0 ? s : 26 + (s % 26); return [...str] .map((l, i) => { const c = str.charCodeAt(i); if (c >= 65 && c <= 90) return String.fromCharCode(((c - 65 + n) % 26) + 65); if (c >= 97 && c <= 122) return String.fromCharCode(((c - 97 + n) % 26) + 97); return l; }) .join(''); };
caesarCipher('Hello World!', -3); // 'Ebiil Tloia!' caesarCipher('Ebiil Tloia!', 23, true); // 'Hello World!'

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