Task

Select certain elements from an Array into a new Array in a generic way.



To demonstrate, select all even numbers from an Array.

As an option, give a second solution which filters destructively,
by modifying the original Array rather than creating a new Array.




let numbers = [1,2,3,4,5,6]
let even_numbers = numbers.filter { $0 % 2 == 0 }
println(even_numbers)