Removes and returns the first element of the collection.
SDK
- Xcode 10.0+
Framework
- Swift Standard Library
Declaration
@discardableResult mutating func removeFirst() -> Element
Return Value
The removed element.
Discussion
The collection must not be empty.
var bugs = ["Aphid", "Bumblebee", "Cicada", "Damselfly", "Earwig"]
bugs.removeFirst()
print(bugs)
// Prints "["Bumblebee", "Cicada", "Damselfly", "Earwig"]"
Calling this method may invalidate any existing indices for use with this collection.
Complexity: O(n), where n is the length of the collection.