I don't understand "If you were to put a new line between the two rows, you could log a 2D object—a square—to the console"





So you have example of var newArray = [[1,1],[1,1]];.
They are placed in same line. If you were to put a new-line separator then your arrays would look like
[1,1] <-- this is 1. line
[1,1] <-- this is 2. line

And square is something they make look like when they are in this formation.


If you don't focus on numbers you can see that shape is square. 2 numbers wide and 2 numbers high.
It's just a visual expression.


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