H2048

A Haskell implementation of the game 2048

Gregor Ulm 2014

The original version of 2048 can be played online here: gabrielecirulli.github.io/2048/

This program covers the game logic and IO, allowing you to play 2048 in the console.

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Files:

• README.md: this file
• h2048.bak01: initial release, referred to in my blog post "Implementing the game 2048 in less than 90 lines of Haskell"
• h2048.hs: current version, with changes due to community feedback

Rules:

• the starting position is always the same
• there are 4 moves: up, down, left, right; those inputs move all tiles in the respective direction
• two adjacent tiles with the same number merge into one tile that holds the sum of those numbers
• if, after a move, the board position has changed, one of the free tiles will turn into a 2 or a 4
• the game is over when the player has no move left, or when the number 2048 has been reached

Controls:

• QUERTY: WASD
• Dvorak: CHTN
• e.g. in order to move all tiles up, you would have to press and release W or C

Execution:

• start the program by calling 'main'

Notes:

• this is a prototype with a minimal terminal window UI
• it has been tested in GHCi 7.6.3 in Apple OS X and Linux

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Change Log:

2014-06-15

Initial release; game fully functional, but might require pushing ENTER after a move was entered, depending on your system configuration. I noticed that this was only an issue in OS X, but not in Linux.

2014-06-16

Dan Rosén (https://github.com/danr) sent a pull request, containing several changes and additions. The following is a direct consequence of his submission:

• disabled input buffering
• support for Dvorak
• printf for printing the grid
• separate function for randomly choosing an element of a list

2014-06-17

Github user qzchenwl (https://github.com/qzchenwl) submitted a patch that allows eta-reduction for the function 'move'.

2014-06-18

The starting position was randomized.