We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
  1. Prepare
  2. Algorithms
  3. Strings
  4. Caesar Cipher
  5. Discussions

Caesar Cipher

  • vuhuutuan0
     + 0 comments

    My answer in Typescript

    const letter = 26;
const encrypt_char = (char: string, k: number): string => {
    k = k % letter

    // ASCII codes
    let ct_min, ct_max = 0
    if (/([a-z])/.test(char)) ct_max = (ct_min = 97) + letter - 1;
    if (/([A-Z])/.test(char)) ct_max = (ct_min = 65) + letter - 1;

    // Only encrypt letter (mean a-z or A-Z)
    if (!ct_min || !ct_max) return char;

    let code = char.charCodeAt(0)
    let code_encrypted = code + k

    if (code_encrypted > ct_max) code_encrypted -= letter
    return String.fromCharCode(code_encrypted)
}
function caesarCipher(s: string, k: number): string {
    // doin encrypt every character in string
    return s.split('').map(c => encrypt_char(c, k)).join('')
}