JSFiddle - React, Tailwind, and code Playground

by ilyautkin

HTML

<div id="tetris">
  <span id="start-btn">START</span>
</div>

CSS

#tetris {
  display: inline-block;
  width: 264px;
  height: 440px;
  border: 2px solid #000;
  line-height: 0px;
  background: #000;
}
#tetris b, #tetris i {
  display: inline-block;
  width: 20px;
  height: 20px;
  background: #000;
  border: 1px solid #333;
}
#tetris i {
  background: #fff;
  border-color: #999;
}
#start-btn {
  display: block;
  width: 30%;
  margin: 70% auto 0;
  padding: 20px;
  background: #eee;
  text-align: center;
  cursor: pointer;
}
#start-btn:hover {
  background: #fff;
}

JavaScript

var Tetris = {
  config: {
    pitchID: "tetris",
    freeBrick: "<b></b>",
    filledBrick: "<i></i>"
  },
  startBtn: document.getElementById('start-btn'),
  pitch: {
    width: 12,
    height: 20,
    bricks: [],
    getDom: function() {
      return document.getElementById(Tetris.config.pitchID);
    }
  },
  figure: {
		coords: [],
    go: function() {
      if (this.coords.length == 0) {
        this.create();
      } else {
        this.process();
      }
    },
    create: function() {
      this.coords = [
        [[-1,5],[-1,6]],
         [[0,5], [0,6]]
      ];
    },
    process: function() {
      if (this.touched()) {
        this.joinToBricks();
        if (!Tetris.checkGameOver()) {
        	this.destroy();
        }
      } else {
        this.makeStep();
      }
    },
    touched: function() {
      var contact = false;
      Tetris.each(this.coords, function(i,j){
        var figureRow = Tetris.figure.coords[i][j][0];
        if (Tetris.pitch.bricks[figureRow + 1]  == undefined) {
          contact = true;
        }
      });
      if (contact) {
        return contact;
      }
      Tetris.each(this.coords, function(i,j){
        var figureRow = Tetris.figure.coords[i][j][0];
        var figureCol = Tetris.figure.coords[i][j][1];
        if (Tetris.pitch.bricks[figureRow + 1][figureCol]) {
          contact = true;
        }
      });
      if (contact) {
        return contact;
      }
      return false;
    },
    joinToBricks: function() {
      Tetris.each(this.coords, function(i,j){
        var figureRow = Tetris.figure.coords[i][j][0];
        var figureCol = Tetris.figure.coords[i][j][1];
        if (figureRow >= 0) {
          Tetris.pitch.bricks[figureRow][figureCol] = 1;
        }
      });
    },
    destroy: function() {
      this.coords = [];
    },
    makeStep: function() {
      Tetris.each(this.coords, function(i,j){
        Tetris.figure.coords[i][j][0]++;
      });
    },
    checkCoords: function(row, col) {
      var...