Part of the code for my game of life React project.

play_method-game_of_life.js

play = () => {
  let g = this.state.gridFull;
  let g2 = arrayClone(this.state.gridFull);

  for (let i = 0; i < this.rows; i++) {
    for (let j = 0; j < this.cols; j++) {
      let count = 0;
      if (i > 0) if (g[i - 1][j]) count++;
      if (i > 0 && j > 0) if (g[i - 1][j - 1]) count++;
      if (i > 0 && j < this.cols - 1) if (g[i - 1][j + 1]) count++;
      if (j < this.cols - 1) if (g[i][j + 1]) count++;
      if (j > 0) if (g[i][j - 1]) count++;
      if (i < this.rows - 1) if (g[i + 1][j]) count++;
      if (i < this.rows - 1 && j > 0) if (g[i + 1][j - 1]) count++;
      if (i < this.rows - 1 && this.cols - 1) if (g[i + 1][j + 1]) count++;
      if (g[i][j] && (count < 2 || count > 3)) g2[i][j] = false;
      if (!g[i][j] && count === 3) g2[i][j] = true;
    }
  }
  this.setState({
    gridFull: g2,
    generation: this.state.generation + 1
  });

}