Encode / decode example for Paul

encode.js

/**
 * This function takes any words and splits them up into individual letters.
 *
 * @param {String} Input string
 *
 * @return {Array}
 */
function tokenize (input) {
   return input.split('');
}
 
/**
 * This function shifts any single letter and keyboard character "up" one.
 *
 * @param {String} Input character
 *
 * @return {String}
 */
function shift (input, offset) {
    var code = input.charCodeAt(0) + offset;
    return String.fromCharCode(code);;
}
 
 
 
/**
 * Transforms any input string using the "shift" function.
 *
 * @param {String} Input string
 *
 * @return {String}
 */
function encode (input) {
    // Split the input into "tokens" (individual characters)
    var tokens = tokenize(input);
    var output = [];
    
    // Loop through each character and encode it
    for (var i = 0; i < tokens.length; i++) {
        var result = shift(tokens[i], 1);
        output.push(result);
    }
    
    // Join all of the individual letter back together!
    return output.join('');
}
 
/**
 * Transforms any input string using the "shift" function.
 *
 * @param {String} Input string
 *
 * @return {String}
 */
function decode (input) {
    // Split the input into "tokens" (individual characters)
    var tokens = tokenize(input);
    var output = [];
    
    // Loop through each character and encode it
    for (var i = 0; i < tokens.length; i++) {
        var result = shift(tokens[i], -1);
        output.push(result);
    }
    
    // Join all of the individual letter back together!
    return output.join('');
}
 
var encoded = encode('hello world');
var decoded = decode(encoded);
 
alert(encoded + ' | ' + decoded);