Get first last element in Swift

To get the first and last element of an array in Swift, you can use the first and last properties respectively. Here is an example:

var numbers = [1, 2, 3, 4, 5]
let firstElement = numbers.first // Returns 1

let lastElement = numbers.last // Returns 5

If the array is empty, first and last will both return nil. In this case, you can use the safe subscript operator to avoid a runtime error:

let emptyArray = [Int]()
if let firstElement = emptyArray.safe[0], let lastElement = emptyArray.safe[emptyArray.count - 1] {

    // Do something with the first and last element

}

else {

    // Handle the case where the array is empty

}

The safe subscript operator allows you to access an array element by index, and returns nil if the index is out of bounds. You can define this operator as an extension to the Collection protocol like this:

extension Collection {
    subscript(safe index: Index) -> Element? {
        return indices.contains(index) ? self[index] : nil
    }
}

With this extension, you can safely access an element of any collection by index without needing to check if the index is within bounds.