Cipher Caesar - symbols and additional characters

Question

Cipher Caesar - symbols and additional characters

I've constructed a Caesar Cipher script down below, however, I wish for the output string to contain spaces and other characters. Despite my attempts with regex, it doesn't seem to rectify the issue or maybe I'm not utilizing it correctly – unsure of which.

Any assistance would be greatly appreciated. Thank you!

function caesarCipher(str, n) {
  let newStr = '';
  let alphabet = 'abcdefghijklmnopqrstuvwxyz'.split('')
  let regex = /[a-z]/

  for (let i = 0; i < str.length; i++) {
    if (str[i].match(regex) === false) {
      newStr += str[i]
      continue;
    }
    let currentIndex = alphabet.indexOf(str[i]);
    let newIndex = currentIndex + n;
    newStr += alphabet[newIndex];
  }
  return newStr
}

console.log(caesarCipher('ebiil tloia!', 3)) //should return hello world! but returns hellocworldc

javascript arrays string caesar-cipher

Answer 1

Answer №1

When using <code>RegExp.test, a boolean value is returned while String.match returns an array. To ensure accurate results, consider the following:

If you encounter this line of code: 
if (str[i].match(regex) === false) {

It is recommended to rewrite it as follows:

If (regex.test(str[i]) === false) {

This revised code will effectively handle any values that are not lowercase letters including spaces, punctuation marks, and so on. To include uppercase letters as well, simply add the i flag at the end of the regex pattern like so: /[a-z]/i

Answer 2

When using <code>RegExp.test, a boolean value is returned while String.match returns an array. To ensure accurate results, consider the following:

If you encounter this line of code: 
if (str[i].match(regex) === false) {

It is recommended to rewrite it as follows:

If (regex.test(str[i]) === false) {

This revised code will effectively handle any values that are not lowercase letters including spaces, punctuation marks, and so on. To include uppercase letters as well, simply add the i flag at the end of the regex pattern like so: /[a-z]/i

Answer 3

Answer №2

To start, ensure that the shift value passed to the function is 3. Next, considering that there are no spaces in the alphabet, you must include a validation step:

function caesarCipher(str, n) {
  let newStr = '';
  let alphabet = 'abcdefghijklmnopqrstuvwxyz'.split('')
  let regex = /[a-z]/

  for (let i = 0; i < str.length; i++) {
    if (str[i].match(regex) === false) {
      newStr += str[i]
    }
    let currentIndex = alphabet.indexOf(str[i]);
    if (!(currentIndex + 1)) {
      newStr += " ";
    } else {
      let newIndex = currentIndex + n;
      newStr += alphabet[newIndex];
    }
  }
  return newStr
}

console.log(caesarCipher('ebiil tloia!', 3)) //should return hello world! but returns hellocworldc

Answer 4

To start, ensure that the shift value passed to the function is 3. Next, considering that there are no spaces in the alphabet, you must include a validation step:

function caesarCipher(str, n) {
  let newStr = '';
  let alphabet = 'abcdefghijklmnopqrstuvwxyz'.split('')
  let regex = /[a-z]/

  for (let i = 0; i < str.length; i++) {
    if (str[i].match(regex) === false) {
      newStr += str[i]
    }
    let currentIndex = alphabet.indexOf(str[i]);
    if (!(currentIndex + 1)) {
      newStr += " ";
    } else {
      let newIndex = currentIndex + n;
      newStr += alphabet[newIndex];
    }
  }
  return newStr
}

console.log(caesarCipher('ebiil tloia!', 3)) //should return hello world! but returns hellocworldc

Cipher Caesar - symbols and additional characters

Answer №1

Answer №2

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