String common Rot13 obfuscator - Node.js String

Node.js examples for String:Algorithm

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Description

String common Rot13 obfuscator

Demo Code


function rot13(str)     // An easy-to understand implementation of the famous and common Rot13 obfuscator.
{                       // You can do this in three lines with a complex regular experssion, but I'd have
    var retVal = "";    // trouble explaining it in the future.  There's a lot to be said for obvious code.
    for (var i in str)
    {/*from www. j a  v  a2 s  .c  o  m*/
        var ch = str[i];
        var code = 0;
        if ("abcedfghijklmABCDEFGHIJKLM".indexOf(ch) >= 0)
        {            
            code = str.charCodeAt(i) + 13;  // It's okay to use 13.  It's not a magic number, it's called rot13.
            retVal = retVal + String.fromCharCode(code);
        }
        else if ("nopqrstuvwxyzNOPQRSTUVWXYZ".indexOf(ch) >= 0)
        {
            code = str.charCodeAt(i) - 13;  // It's okay to use 13.  See above.
            retVal = retVal + String.fromCharCode(code);
        }
        else
        {
            retVal = retVal + ch;
        }
    }
    return retVal;
}

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