Replace NaNs with the number that appears to its left in the row.
Back to basics 9 - Indexed References
Flag largest magnitude swings as they occur
Length of the hypotenuse
Sum of diagonals elements of a matrix
Number of paths on a n-dimensional grid
Make a rainbow matrix (follow-up to checkerboard matrix)
Smallest n, for n! to have m trailing zero digits
Number of even divisors of a given number
Under the sea: Snell's law & total internal reflection
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