Coderbyte – Caesar Cipher
Have the function CaesarCipher(str,num) take the str parameter and perform a Caesar Cipher shift on it using the num parameter as the shifting number. A Caesar Cipher works by shifting each letter in the string N places in the alphabet (in this case N will be num). Punctuation, spaces, and capitalization should remain intact. For example if the string is “Caesar Cipher” and num is 2 the output should be “Ecguct Ekrjgt”.
// Caesar Cipher function that takes in a string and a number as parameters
function CaesarCipher(str,num) {
// Splitting the string into an array of characters and mapping over each character
str = str.split('').map(function(s){
// Converting the character to its ASCII code
s = s.charCodeAt();
// Checking if the character is an alphabet
if ((s > 64 && s < 91) || (s > 96 && s < 123)) {
// Adding the shift number to the ASCII code
s = s+num;
// Checking if the ASCII code is outside the range of alphabets
if ((s > 90 && s < 97) || s > 122) {
// If it is, wrap around the alphabets by subtracting 26
s -= 26
}
}
// Converting the ASCII code back to its character form
return String.fromCharCode(s)
})
// Joining the array of characters back to form a string
return str.join('')
}
// keep this function call here
console.log(CaesarCipher(readline()));
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