Function returns the sum of all indexes of elements of 'arr' that can be paired with one other element to form a sum that equals the value in the second argument 'arg'. If multiple sums are possible, function returns the smallest sum. Once an element has been used, it cannot be reused to pair with another.
A script by V.
Simon game software implementation. User is presented a random series of button presses. Each time user inputs a series of button presses correctly, user sees the same series of button presses but with an additional step. User hears a sound that corresponds each button both when the series of button presses plays, and when user personally presses a button. If user presses a wrong button, user is notified that he has done so, and that series of button presses starts again to remind the pattern so user can try again. User can see how many steps are in the current series of button presses. User can hit restart button during gameplay, and the game will return to a single step. User can play in strict mode where if user gets a button press wrong, notification is presented that user has done so, and the game restarts at a new random series of button presses.
A common modern use of the simplest and most widely known ciphers, Caesar cipher, is the ROT13 cipher, where the values of the letters are shifted by 13 places. Thus 'A' ↔ 'N', 'B' ↔ 'O' and so on.
The rot13() function takes a ROT13 encoded string as input and returns a decoded string. All letters must be uppercase.
The CaesarCryptoCoder() function takes a string of characters and a shift value. It uses double length alphabet, including all lower case and upper case characters: a-zA-Z.
The CaesarsCipher class should be instantiated with new provided a shift value. The instance can be used to encode/decode strings. Resulting string letters are converted to upper case after encoding/decoding.
A function that sums two arguments together. If only one argument is provided, it returns a function that expects one argument and returns the sum. For example, add(2, 3) should return 5, while add(2) should return a function. Calling this returned function with a single argument will then return the sum. If either argument isn't a valid number, returns undefined.
A script by V.
