Basic React Babel ES6 Fiddle

by Ved prakash

HTML

<script src="https://fb.me/react-dom-0.14.3.js"></script>
<div id="container">
        
</div>

CSS

#game-layout {
    width: 360px;
    height: 245px;
    margin: 60px auto 0 auto;
    background-color: whitesmoke;
    padding: 15px 5px 218px 10px;
    border-radius: 5px;
    border-bottom: 5px solid #42729B;
}

.move-index{
    background-color: grey;
}

td {
    height: 40px;
    border-bottom: 3px solid grey;
    border-radius: 10px;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    background-color: #ecf0f1;
    color: #2c3e50;
    margin: 4px;
}


td {
    float: left;
    width: 75px;
}
td:hover{
  font-size: 28px;
}

.replay-btn {
    margin-top:40px
}

Babel + JSX

class Game extends React.Component {
    constructor() {
        super();
        this.state = {
            nextMovePosition: [2, 2],
            gameNumbers: this.initialData(),
            totalClicks: 0
        };
        this.maxBound = this.state.gameNumbers.length - 1; // boundary condition
        this.minBound = 0;								  // boundary condition
        this.isValidMoveIndex = false;
    }

    //Initail gameNumbers value
    initialData() {
        return [
            [2, 1, 6, 11],
            [9, 13, 5, 8],
            [4, 3, "", 15],
            [10, 14, 12, 7]
        ]
    };


    checkRowShift(row, col) {

        let {nextMovePosition, gameNumbers, totalClicks} = this.state;
        const i = nextMovePosition[0];
        const j = nextMovePosition[1];

        //Horizontal row shift
        if (row === i) {
            nextMovePosition = [row, col];
            gameNumbers[i].splice(j, 1);
            gameNumbers[row].splice(col, 0, "");
            this.setState({gameNumbers: gameNumbers, nextMovePosition: nextMovePosition, totalClicks: totalClicks + 1});
        }

        //Vertical row shift
        else if (col === j) {
            let tempArrForSwap = [];
            nextMovePosition = [row, col];
            let index = 0;
            while (index < gameNumbers.length) {
                tempArrForSwap[index] = gameNumbers[index][col];
                index++;
            }
            if (row < i) {
                tempArrForSwap.splice(row, 0, '');
                tempArrForSwap.splice(i + 1, 1);
            } else {
                tempArrForSwap.splice(row + 1, 0, '');
                tempArrForSwap.splice(i, 1);
            }
            index = 0;
            while (index < gameNumbers.length) {
                gameNumbers[index][col] = tempArrForSwap[index];
                index++;
            }
            this.setState({gameNumbers: gameNumbers, nextMovePosition: nextMovePosition, totalClicks: totalClicks + 1});
        }
   ...