Instance Method

contains(_:)

Returns a Boolean value that indicates whether the given element exists in the set.

Declaration

func contains(_ member: Element) -> Bool

Parameters

member: An element to look for in the set.

Return Value

true if member exists in the set; otherwise, false.

Discussion

This example uses the contains(_:) method to test whether an integer is a member of a set of prime numbers.

let primes: Set = [2, 3, 5, 7]
let x = 5
if primes.contains(x) {
    print("\(x) is prime!")
} else {
    print("\(x). Not prime.")
}
// Prints "5 is prime!"

Complexity: O(1)

Relationships

From Protocol

SetAlgebra