Thanks for the fun problem!
So compact! I didn't know about arrayfun and cellfun. Very useful functions.
Took a couple of tries, but I got it! :)
Test for balanced parentheses
Project Euler: Problem 8, Find largest product in a large string of numbers
Hankelize a matrix
Divisible by 4
String Array Basics, Part 3: Convert Cell Array with Missing Values to String Array
Apply Function to Each Field of a Structure Array: Part 1
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