tetrisjs

Functional tetris

A functional (pure, side-effect free) tetris logic libary.

NOTE: warning I've spent only a couple hours on this so far:

• likely to change
• no tests
• sparse example

Structure

Works with 2 dimensional arrays ([0][0] = top left) to represent:

• the board[rows][cols]: each cell is a number which specifies a color (specific to each type of block)

• a block[rows][cols]: a tetris block (see ./blocks.js)

Usage

const {
    blocks,
    createBoard,
    printBoard,
    canAddBlockToBoard,
    addBlockToBoard,
    rotateBlock,
    changeCell,
    mapCells,
    getCompletedRows,
} = require('./tetris') ;

• blocks: exposes tetris blocks defined in blocks.js
• createBoard(rows, cols): board: create a board with size of rows x cols
• printBoard(board): board: console.logs board
• canAddBlockToBoard(board, block, row, col): boolean: can block be added to board at position row, col?
• addBlockToBoard(board, block, row, col): board: create new board with block added to board at position row, col
• rotateBlock(block): block: creates a new block turned clockwise
• changeCell(board, row, col, cell): board: create new board with cell added to board at position row, col
• mapCells(board, callback): board: create new board by applying callback on each cell in board
• getCompletedRows(board): indexes: returns an array of row indexes that are complete for given board

Files

• tetris.js: logic to 'mutate' boards and blocks

• example.js: shows how to use tetris.js

• blocks.js: the different types of tetris blocks

• 2dArrayUtils.js: common low-level functions to 'mutate' boards and blocks