"cat" is a really nice touch for concatenation of those arrays! your solutions never fail my expectation.
by the way, i saw that "sub-func" comment...:)
Calling the two sub-functions the right way will not hurt your score. Great work though. :)
Replace NaNs with the number that appears to its left in the row.
surface of a spherical planet
Swap two numbers
Side of a rhombus
Sum of Two Numbers
Product of Each Column
Find the starting index of a consecutive condition
Find the largest number
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