Instance Method

contains(_:)

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

Declaration

func contains(_ element: Entity) -> 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.

See Also

Finding Entities

func contains(where: (Entity) -> Bool) -> Bool

Returns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.

func allSatisfy((Entity) -> Bool) -> Bool

Returns a Boolean value indicating whether every element of a sequence satisfies a given predicate.

var first: Entity?

The first element of the collection.

func first(where: (Entity) -> Bool) -> Entity?

Returns the first element of the sequence that satisfies the given predicate.

func max(by: (Entity, Entity) -> Bool) -> Entity?

Returns the maximum element in the sequence, using the given predicate as the comparison between elements.

func min(by: (Entity, Entity) -> Bool) -> Entity?

Returns the minimum element in the sequence, using the given predicate as the comparison between elements.

func randomElement() -> Entity?

Returns a random element of the collection.

func randomElement<T>(using: inout T) -> Entity?

Returns a random element of the collection, using the given generator as a source for randomness.