how do you find this formula?

never saw abs before) thanks

Wow, great answer. This answer demostraste that knowledge of a language is key. Great solution!

Approved by someone

genius

Functions With an Implicit Return
search here - https://docs.swift.org/swift-book/LanguageGuide/Functions.html

Where "return"? How it work?

I like this solution a lot!

Thank you so much brother

Sure thing! This is the Ternary Operator, it's basically a single line if condition. The question mark asks whatever is on it's left if it's true or false. It then tells the colon to pick whatever is to it's left if the condition is true, or to it's right if the condition is false

You should take a look at the official Swift documentation https://docs.swift.org/swift-book/LanguageGuide/BasicOperators.html. You can search for Ternary and you'll find whatever you're looking for

hey could someone explain this code to me please

Hi there! Is is possible for you to explain this line of code in a bit more human way? I am still very new to Swift and I would like to understand what actually does this abs, reduce(1,*) :)) Thanks in advance for that!

it's makes additional memory allocations on any appends on filtered array

Lovely <3 gg wp

Keep array of elements lengths is better practice than using joined every iteration.
I used same approach