JavaScript Array Manipulation: Issues with forEach

let gameBoard = Array(3)
    .fill()
    .map(() => Array(3).fill("X")); //Create 2D Array  

const resetGameBoard = () =>
    gameBoard.forEach((arr, index) => {
      console.log(arr === gameBoard[index]); // this shows they are the same object?

      console.log(arr.map((item) => item = ""));
      arr = arr.map((item) => item = "");
    });

resetGameBoard();
console.log(gameBoard);