Instance Method

contains(_:)

Returns a Boolean value indicating whether the sequence contains the given element.

Declaration

func contains(_ element: Element) -> Bool

Parameters

element

The element to find in the sequence.

Return Value

true if the element was found in the sequence; otherwise, false.

Discussion

This example checks to see whether a favorite actor is in an array storing a movie’s cast.

let cast = ["Vivien", "Marlon", "Kim", "Karl"]
print(cast.contains("Marlon"))
// Prints "true"
print(cast.contains("James"))
// Prints "false"

Complexity: O(n), where n is the length of the sequence.