filter(_:)
Returns a new set containing the elements of the set that satisfy the given predicate.
Declaration
func filter(_ isIncluded: (Element) throws -> Bool) rethrows -> Set<Element>Parameters
- isIncluded:
A closure that takes an element as its argument and returns a Boolean value indicating whether the element should be included in the returned set.
Return Value
A set of the elements that isIncluded allows.
Discussion
In this example, filter(_:) is used to include only names shorter than five characters.
let cast: Set = ["Vivien", "Marlon", "Kim", "Karl"]
let shortNames = cast.filter { $0.count < 5 }
shortNames.isSubset(of: cast)
// true
shortNames.contains("Vivien")
// false