Search in array of precise positions

I currently have a painting with 64 tiles, each color is defined. Grey is a valid position, black is an invalid position (a wall), green is player pawn 1 and red is player pawn 2. When player 1 clicks on his green pawn he can choose to duplicate himself on a valid tile close to him (Grey) or jump on the 2nd tile close to him. If ever the green pawn is a tile close to the red pawn it becomes green Now what I’m looking for is.

How to search for all valid positions either a ready tile or jump on the 2nd and correctly checked what is there afterwards.

class Game{
        constructor(){
            super();
            this.default_grid = null;
            this.curr_grid_playing = null;
            this.player = 1;
            this.curr_player_turn = 1;
            this.game_is_ready = false;
            this.rows = [];

            this.do_new_game();
        }

        get_random_grid(){
            const array_grid = [
                "3100000010000000000000000003300000033000000000000000000200000023",
                "1000000200300300033003300000000000000000033003300030030010000002",
                "0000000000000000033300300313203003013230030033300000000000000000",
                "0000000000000000003033000313003003230030003033000000000000000000"
            ];
            return array_grid[Math.floor(Math.random()*array_grid.length)];
        }

        do_new_game(){
            this.default_grid = this.get_random_grid();
            this.curr_grid_playing = this.default_grid;
            
            for(let i = 0; i < this.default_grid.length; i++){   
                if(i % 8 == 0)
                    this.rows.push([]);
                this.rows[this.rows.length - 1].push([i, this.default_grid.charAt(i)]);

                let new_game_node = this.create_game_button(this.default_grid.charAt(i), i);
                this.append_child_node(new_game_node);
                
            }     
        }

        get_grid_possibilities(from_index){
            if(this.curr_player_turn == 1 && (this.curr_player_turn == this.player)){
               console.log(this.rows);
               
            } else if(this.curr_player_turn == 2 && (this.curr_player_turn == this.player)){

            }
        }
    }

I was thinking about making a graphic in a array to represent exactly the grid < this.rows > is what our console displays, it works, but I’m not sure exactly if it’s not too complex.

Answer

You already have the matrix representing your board game, so you just have to check for the -1 and +1 squares.

let characterPosition = {x:5, y:5};

for (let row-1; row<=1; row++) {
    for (let col-1; col<=1; col++) {
        
        let testPosX = characterPosition.x + col;
        let testPosY = characterPosition.y + row;
        
        if (row===0 && col===0) {
            // player pos -> skip
            break;
        }
        
        if (testPosX<0 || testPosY<0 || testPosY>matrix.length-1 || testPosX>matrix[0].length-1) {
            // outside board -> skip
            break;
        }
        
        if (matrix[testPosY][testPosX]===0) {
            // this is a empty square
        } else {
            // this is not an empty square
        }
        
    }
}

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Answer