Maby this one needs some more test suites ;)
improve test suit
Maybe more test cases here? ;-)
Replace NaNs with the number that appears to its left in the row.
First N Perfect Squares
Project Euler: Problem 2, Sum of even Fibonacci
Determine Whether an array is empty
Find the area of the four walls
Concatenate two strings
Find the square of the sum of the digits of a number
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