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Apr 25th, 2019
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  1. function Square(props) {
  2. return (
  3. <button className="square" onClick={props.onClick}>
  4. {props.value}
  5. </button>
  6. );
  7. }
  8.  
  9. //---------------- Board Component ------------------
  10. class Board extends React.Component {
  11. renderSquare(i) {
  12. return (
  13. <Square
  14. value={this.props.squares[i]}
  15. onClick={() => this.props.onClick(i)}
  16. />
  17. );
  18. }
  19.  
  20. render() {
  21. return (
  22. <div className="board">
  23. {
  24. [1,2,3].map( (x) => {
  25. return <div key={x} className="board-row">
  26. {
  27. [1*(x+1),2*(x+2),3*(x+3)].map( (y) => {
  28. return this.renderSquare(y);
  29. })
  30. }
  31. </div>
  32. })
  33. }
  34. </div>
  35. )
  36. }
  37. }
  38.  
  39.  
  40. class Game extends React.Component {
  41. constructor(props) {
  42. super (props);
  43. this.state = {
  44. history: [{
  45. squares: Array(9).fill(null),
  46. }],
  47. stepNumber: 0,
  48. xIsNext: true
  49. };
  50. }
  51.  
  52. //----------------------History Component---------------------
  53. handleClick(i) {
  54. console.log("does this do anything?")
  55. const history = this.state.history.slice(0, this.state.stepNumber +1);
  56. const current = history[history.length - 1];
  57. const squares = current.squares.slice();
  58. // Calls a copy of squares array to modify
  59. if(calculateWinner(squares) || squares[i]) {
  60. return;
  61. }
  62. // Returns early by ignoring click if there is a winner or square is filled.
  63. squares[i] = this.state.xIsNext ? 'X' : 'O';
  64. this.setState({
  65. history: history.concat([{
  66. squares: squares
  67. }]),
  68. stepNumber: history.length,
  69. xIsNext: !this.state.xIsNext,
  70. });
  71. }
  72.  
  73. jumpTo(step) {
  74. this.setState({
  75. stepNumber:step,
  76. xIsNext: (step % 2) === 0,
  77. });
  78. }
  79.  
  80. render() {
  81. const history = this.state.history;
  82. const current = history[this.state.stepNumber];
  83. const winner = calculateWinner(current.squares);
  84.  
  85. const moves= history.map((step, move) => {
  86. const desc = move ?
  87. 'go to move #' + move:
  88. 'Go to game start';
  89. return (
  90. <li key={move}>
  91. <button onClick={() => this.jumpTo(move)}>{desc}</button>
  92. </li>
  93. );
  94. });
  95.  
  96. let status;
  97. if (winner) {
  98. status = 'Winner: ' + winner;
  99. } else {
  100. status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
  101. }
  102.  
  103. return (
  104. <div className="game">
  105. <div className="game-board">
  106. <Board
  107. squares={current.squares}
  108. onClick={(i) => this.handleClick(i)}/>
  109. </div>
  110. <div className="game-info">
  111. <div>{status}</div>
  112. <ol>{moves}</ol>
  113. </div>
  114. </div>
  115. );
  116. }
  117. }
  118.  
  119. // ========================================
  120.  
  121. ReactDOM.render(
  122. <Game />,
  123. document.getElementById('root')
  124. );
  125.  
  126. function calculateWinner(squares) {
  127. const lines = [
  128. [0, 1, 2],
  129. [3, 4, 5],
  130. [6, 7, 8],
  131. [0, 3, 6],
  132. [1, 4, 7],
  133. [2, 5, 8],
  134. [0, 4, 8],
  135. [2, 4, 6],
  136. ];
  137. for (let i = 0; i < lines.length; i++) {
  138. const [a, b, c] = lines[i];
  139. if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
  140. return squares[a];
  141. }
  142. }
  143. return null;
  144. }
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