Accesses the element at the specified position.
- Xcode 8.0+
The position of the element to access.
positionmust be a valid index of the collection that is not equal to the
For example, you can replace an element of an array by using its subscript.
You can subscript a collection with any valid index other than the collection’s end index. The end index refers to the position one past the last element of a collection, so it doesn’t correspond with an element.