https://github.com/julesss-coder/caesar-cipher
Caesar cipher in JavaScript (my solution to a task on The Odin Project)
https://github.com/julesss-coder/caesar-cipher
Last synced: 10 days ago
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Caesar cipher in JavaScript (my solution to a task on The Odin Project)
- Host: GitHub
- URL: https://github.com/julesss-coder/caesar-cipher
- Owner: julesss-coder
- Created: 2020-11-12T12:29:58.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-11-12T12:41:08.000Z (over 5 years ago)
- Last Synced: 2025-01-05T10:22:06.758Z (over 1 year ago)
- Language: JavaScript
- Size: 2.93 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Julesss-coder's solution to "caesar cipher"
This is my solution to an exercise in test-driven development by The Odin Project (https://github.com/TheOdinProject/javascript-exercises/tree/master/caesar).
Exercise: see below.
# Exercise XX - caesar cipher
Implement the legendary caesar cipher:
> In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
Hint: You may need to convert letters to their unicode values. Be sure to read the documentation!
write a function that takes a string to be encoded and a shift factor and then returns the encoded string:
```javascript
caesar('A', 1) // simply shifts the letter by 1: returns 'B'
```
the cipher should retain capitalization:
```javascript
caesar('Hey', 5) // returns 'Mjd;
```
should _not_ shift punctuation:
```javascript
caesar('Hello, World!', 5) //returns 'Mjqqt, Btwqi!'
```
the shift should wrap around the alphabet:
```javascript
caesar('Z', 1) // returns 'A'
```
negative numbers should work as well:
```javascript
caesar('Mjqqt, Btwqi!', -5) // returns 'Hello, World!'
```