I have a matrix(matrix) of objects which have a property "state", initially set as false. Then I generated some random coordinates(randomCellsCoordinates) and put them in another matrix to set some of these object's "state" property to true. Initially I tried to do a forEach loop as below:

// randomCellsCoordinates --> [ [ 2, 2 ], [ 2, 1 ], [ 2, 0 ], [ 1, 1 ] ]
randomCellsCoordinates.forEach( pair => { 
  matrix[pair[0]][pair[1]].state = true
});

But this didn't work out by setting to true all of objects of this matrix.

[
  [ { state: true }, { state: true }, { state: true } ],
  [ { state: true }, { state: true }, { state: true } ],
  [ { state: true }, { state: true }, { state: true } ] 
]

Hope you guys can help me out!