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Simple ROT13 function
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// Playground - noun: a place where people can play | |
let lettersArray = Array("ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz") | |
func rot13(input: String) -> String { | |
return reduce(input, "") { result, letter in | |
if let i = find(lettersArray, letter) { | |
return result + lettersArray[i + 13] | |
} else { | |
return result + letter | |
} | |
} | |
} | |
rot13("Hello World!") |
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