I think he's referring to the {} after #map.

stupid me... of course, I was drawing the point (1, 0) rather than (0, 1)

thanks for your help

Yes, because it is to the left. Try to draw the arrow for the vector and the point on a piece of paper and you'll see.

I don't think I understand this:

the first test case is :
vector = [[0, 0], [1, 1]]
point = [0, 1]
Test.assert_equals(point_vs_vector(point, vector), -1)

the way I see it the point is to the right of the vector.
am I missing something ?

great solution. would you by anychance know a good website that explains blocks in details? Cause honestly, without the description of the kata I wouldn't understand what you did.

thanks