this is the commented version of my previous entry (solution 181910)
this is my original submission modified for ease of reading
whoops, didn't see your thing about "easy to understand code."
Find the sum of all the numbers of the input vector
Find the numeric mean of the prime numbers in a matrix.
Are you in or are you out?
Back to basics 2 - Function Path
Function composition - harder
Find best placement for ordered dominoes (harder)
Project Euler: Problem 10, Sum of Primes
Poker Series 11: selectBestHand
Getting logical indexes
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