Instance Method
reserveCapacity(_:)
iOS 8.0+
iPadOS 8.0+
Mac Catalyst 8.0+
macOS 10.10+
tvOS 9.0+
watchOS 2.0+
Prepares the collection to store the specified number of elements, when doing so is appropriate for the underlying type.
mutating func reserveCapacity(_ minimumCapacity: Int)