SafeArray -- a safe Swifty Array abstraction

SafeArray.swift

import Foundation

struct SafeArray<T> {
    private var values: [T]
    
    init(_ values: [T]) {
        self.values = values
    }
    
    subscript(index: Int) -> T? {
        if index >= 0 && values.count > index {
            return values[index]
        }
        return nil
    }
}

extension Array {
    var safe: SafeArray<T> {
        return SafeArray(self)
    }
}

Usage

let safeNumbers = [1,2,3,4].safe

if let fifth = safeNumbers[4] {
   println("I will never be called")
} else {
   println("I WILL be called")
}