This code is part of a program that appears to...

This code is part of a program that appears to relate to a grid-based game, like Tetris. Here's what it does:

1. It defines a method clearFullLines() that scans the game board from the bottom to the top (starting from the row at the bottom, BOARD_HEIGHT - 1, and working its way up).

2. For each row (denoted by y), it checks whether the row is full (every cell in that row has a non-zero value). This is achieved by:

   • Setting a fullLine flag to true initially for each row.
   • Iterating through the columns of that row (via x) and checking if any cell has a 0 value. If 0 is found, the fullLine flag is set to false, and the inner loop exits early (break).

3. If the row is confirmed to be full (i.e., fullLine remains true):

   • The row is cleared/removed by calling a method removeLine(y), which presumably removes the row at index y and shifts rows above it down one position.
   • The y value is incremented (y++). This increment ensures that after removing a full row, the same index is re-checked because all the rows above it will have shifted down, introducing a new row at the y position.

Overall, the method scans the board, identifies full rows, clears them, and ensures all subsequent rows are properly re-evaluated after any deletion. This functionality is typical in grid-based games like Tetris to handle the clearing of completed rows.