2D lists

Two-dimensional list is often used in creating a game that involves a board or a grid such as Chess, Reversi, Checkers, Tetris, Battleship, 2048 and so on.

In a technical term, 2D list is called as an array of arrays or also known as a matrix which can be represented as a table of columns and rows.

The way List Element functions do not provide a convenient way of creating such. Beginners are sometimes misled that plugging the Element input from the output of another List Element works. But fear not, for there is a simple workaround to make it by using simple math. See image below on how to make it!

2D list pictured. *Columns* is equal to 4.

Variables:

X: the index column of a 2D list. It must be noted that this value must not be greater than Columns nor be lesser than 0, as it may read the wrong value.
Y: the index row of a 2D list. A value lesser than 0 produce a sentinel value equivalent to None, which may be useful if all
Columns: the total columns of a 2D list.