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Challenges

Comments on Caesar shift cipher

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Caesar shift cipher

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Introduction

What is the Caesar shift cipher (ROT$n$)? It's basically a cipher sequence that changes a letter's value from the number chosen. If we use ROT1 on "games", we get "hbnft". The basic interpretation of the cipher is iterating the value of a letter by 1 $n$ times. If you still don't understand, try using the ROT13 website.

Challenge

Make a program that takes input of a number from 1 to 25, call it $n$, and takes input of a string. It could be any. Then, use $n$ to convert the string into ROT$n$ and output the result.

Examples of inputs and outputs:

If $n = 4$ and string is "Hello, world.", we get Lipps, asvph.
If $n = 15$ and string is "trololol", we get igdadada.
If $n = 7$ and string is "gxoxk zhggt zbox rhn ni", we get never gonna give you up.
If $n = 24$ and string is "I want breakfast!", we get G uylr zpcyidyqr!.
If $n = 13$ and string is "guvf grkg vf fhf", we get this text is sus.

Shortest program wins.

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Javascript (V8), 202 97 bytes

o=>r=>o.replace(/[a-zA-Z]/g,o=>String.fromCharCode((o<="Z"?90:122)>=(o=o.charCodeAt()+r)?o:o-26))

Try it online!

Since the text of input must be manually changed from the code, here is how to change it, Go to console.log(rot("Hello World")(4)); and change text between "" (String) into anything you want lke console.log(rot("Codidact Code Golf)(4)); and if you want to change ROT$n$, change the number between brackets into anything like console.log(rot("Codidact Code Golf)(13));.

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4 comment threads

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Kevin M. Mansour‭ wrote over 2 years ago · edited over 2 years ago

Hmm, I think No, since I am running on "JavaScript (V8)" but the snippet you added is "JavaScript (NodeJS)".