At a minimum, you should make this problem variable. For example, find the element at the ith row and jth column and define i and j in the test cases, which are passed along with the function.
Back and Forth Rows
Replace NaNs with the number that appears to its left in the row.
First non-zero element in each column
Sum of odd numbers in a matrix
Flip the vector from right to left
Find the last digit
Determine whether the input is divisible by 3 as well as 5
multiply an array by its position number
Calculating selling price
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