Function lastCellColumnwise

Returns the last cell of a grid, column-wise

For uniform grids, this is simply { x: grid.cols - 1, y: grid.rows - 1 }.

For jagged grids, consider all the rows with the max cols. In the below case, row indexes 1 and 2 have the max cols of 3, and we take the last of those rows. Thus the last cell is { x: 2, y: 2 } (position 7)

{ rows: [2, 3, 3, 1] }
0 1
2 3 4
5 6 7
8
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See also firstCellColumnwise