如何访问数组元素的引用（读写数组元素）

Question

I am trying to basically being able to access a specific element of an array in order to read it or to change it (thus the reference idea).

Sure, array[i][j] is the solution.

But I am trying to basically access this element with a specific ID for each element.

Let me show you what I am trying to achieve: I want to access chessboard[0][0] with chessboard.square("a8") and be able to change the value or read it. Each element of my 2D array has an unique id (the chess coordinates, here a8 for [0][0]) and I would find it more convenient to access the element with this ID rather than write the actual array coordinates.

     
     square(coordinate) {
        const {row, col} = this.parseSquareToBoard(coordinate)  
        return this.chessboard[row][col]
     }
     /* the function parseSquareToBoard is used to get the coordinates of the array from the string id (for example parseSquareToBoard("a8") returns {col: 0, row: 0} */


     printBoard() {
        this.square('a1') = "R " // this is the line where I obviously get a ReferenceError
        this.chessboard.map(row => {
            row.map(piece => process.stdout.write(piece ? piece : "X "))
            console.log()
        })
     }

All that is inside a class. Any idea of what I could do to be able to do so? Please let me know if my question needs clarification.

Thanks

Answer 1

No need for a square method:

const { row, col } = this.parseSquareToBoard(coordinate);

this.chessboard[row][col] = "R ";

If you really want to avoid using array[i][j] , make a helper method:

setSquare(coordinate, piece) {
    const { row, col } = this.parseSquareToBoard(coordinate);

    this.chessboard[row][col] = piece;
}

// ...

printBoard() {
    this.setSquare("a8", "R ");
    // ...
}