game-of-life.ts

export class GameOfLife {
    // number[][] == Array<Array<number>>
    protected game:number[][];

    constructor(game:Array<Array<number>>) {
        this.game = game;
    }

    countLivingNeighbours(row:number, column:number) : number {
        let count = 0;

        for (let r = row - 1; r <= row + 1; r++) {
            for (let c = column - 1; c <= column + 1; c++) {
                if (r >= 0 && r < this.game.length &&
                    c >= 0 && c < this.game[0].length &&
                    (c != column || r != row))
                    count += this.game[r][c];
            }
        }

        return count;
    }

    transform():Array<Array<number>> {
        let nextGame:number[][] = [];

        for (let row = 0; row < this.game.length; row++) {
            nextGame[row] = [];
            for (let column = 0; column < this.game[row].length; column++) {
                let n = this.countLivingNeighbours(row, column);
                nextGame[row][column] = this.nextState(this.game[row][column], n);
            }
        }

        return nextGame;
    }

    nextState(state:number, neighbours:number) : number {
        if (state == 0 && neighbours == 3) {
            return 1;
        } else if (state == 1 && neighbours >= 2 && neighbours <= 3) {
            return 1;
        } else {
            return 0;
        }
    }

}