Only after I started working on algorithm problems did I begin to appreciate the efficiency of standard loops over built-in array methods. For very large data processing there are some cases where your solution works and the ones built on array methods fail. Nice work!

So efficient, so clear!

I really like this solution because it reflects how one might sort through the coins in a real life situation.

This one rattled my mind for days! I wanted to solve with no consultations on the problem. This led me to a brute force approach which, predictably, failed for lack of time and resources. Then I looked a bit for hints and came across Warnsdorrf's rule. Things turned around quickly! So, my only suggestion on this kata would be to hint that this requires a strong grasp on solving with algorithms and heuristics, which we might need to research.

I didn't even think to use the spread operator to handle a variety of cases, such as strings, numbers, and arrays of numbers in this way. It's so much more useful and versatile than I thought. Thanks for showing me something new. 😀

Floored by this! A proper use of RegEx, in my view.

It can return any falsy value (0, '', etc), not only false

Quite clever! I thought a ternary operator necessarily begins with an evaluation only, but it seems this ternary starts with a reassignment of the variable argument (the array) that evaluates to something truthy or falsey. But I don't immediately see how it could return false.

Thank you.

Simple and understandable. Very nice.

Wow!

Very elegant code. Nicely done!

Wow! Great use of spread operator. Upvote.