Instance Property

first

The first element of the collection.

Declaration

var first: Entity? { get }

Discussion

If the collection is empty, the value of this property is nil.

let numbers = [10, 20, 30, 40, 50]
if let firstNumber = numbers.first {
    print(firstNumber)
}
// Prints "10"

See Also

Finding Entities

func contains(Entity) -> Bool

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

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.

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.