ROT13

Demo of the p/moul/x/daily/rot13 library — an on-chain port of Go's classic ROT13 cipher, the standard-library strings.Map / io.Reader teaching example. Each ASCII letter is rotated 13 places through the alphabet; everything else is left alone.

Because the alphabet has 26 letters and 13 is exactly half, ROT13 is its own inverse — encoding twice returns the original text.

Example

stage	text
input	Hello, Gno!
ROT13	Uryyb, Tab!
ROT13 again	Hello, Gno!

Try it

• Render("/Uryyb, Tab!") — decode any text (append it to the path).
• Render("/caesar/3/attack at dawn") — a general Caesar shift.

Or call the library functions directly:

rot13.Rot13("Hello, Gno!")     // "Uryyb, Tab!"
rot13.Caesar("attack", 3)      // "dwwdfn"
rot13.Caesar("Hello", 13)      // same as Rot13: "Uryyb"