The Big Nerd Ranch Swift - Ch.22 Bronze Challenge

There is no description of challenge. Becaouse of license.

When I use a header “class someName…” in code block for some code, that means the following code is within the scope of the class named ‘someName’.

I made the filter function that take a clousure as argument and return Element’s array. And then I go though all items in stack whether item is valid in closure.

struct stack...
    func filter(_ isIncluded: (Element) -> Bool) -> [Element] {
        var result = [Element]()
        for item in items {
            if isIncluded(item) {
                result.append(item)
            }
        }
        return result
    }

And use it. You can say any other form of clousre

let evenNumbers = myStack.filter { $0 % 2 == 0}

code