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Accessing indices safely

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By adding the following extension to array indices can be accessed without knowing if the index is inside bounds. 

extension Array {
    subscript (safe index: Int) -> Element? {
        return indices ~= index ? self[index] : nil
    }
}

example: 

if let thirdValue = array[safe: 2] {
    print(thirdValue)
}
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Arrays:
* Arrays
* Basics of Arrays
* Extracting values of a given type from an Array with flatMap
* Flattening the result of an Array transformation with flatMap
* Combining an Arrays elements with reduce combine
* Lazily flattening a multidimensional Array with flatten
* Filtering out nil from an Array transformation with flatMap
* Subscripting an Array with a Range
* Removing element from an array without knowing its index
* Sorting an Array of Strings
* Accessing indices safely
* Filtering an Array
* Finding the minimum or maximum element of an Array
* Sorting an Array
* Transforming the elements of an Array with map
* Useful Methods
* Value Semantics
* Grouping Array values
* Modifying values in an array
* Accessing Array Values
* Comparing 2 Arrays with zip
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