%
) operator and the ternary operator (?
) to calculate the correct encryption/decryption key....
) and Array.prototype.map()
to iterate over the letters of the given string.String.prototype.charCodeAt()
and String.fromCharCode()
to convert each letter appropriately, ignoring special characters, spaces etc.Array.prototype.join()
to combine all the letters into a string.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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