Get matrix fragment in Javascript

some.js

const arr =[
  [1,  2,  3,  4,  5,  6,  7,  8,  9,  ],
  [10, 20, 30, 40, 50, 60, 70, 80, 90, ],
  [11, 12, 13, 14, 15, 16, 17, 18, 19, ],
  [21, 22, 23, 24, 25, 26, 27, 28, 29, ],
  [31, 32, 33, 34, 35, 36, 37, 38, 39, ],
];

const getMatrixFragment = (
  matrix = [[]],
  coords = {startY: 0, endY: 0, startX: 0, endX: 0},
) => matrix
  .slice(coords.startY, coords.endY + 1)
  .map(i => i.slice(coords.startX, coords.endX + 1));

console.log(getMatrixFragment(
  arr,
  {
    startX: 2,
    startY: 0,
    endX: 5,
    endY: 4,
  }
));