Instance Methodswift 6.0.3Swift

    count(where:)

    Returns the number of elements in the sequence that satisfy the given predicate.

    func count<E>(where predicate: (Self.Element) throws(E) -> Bool) throws(E) -> Int where E : Error
    Mangled symbol
    sSTsE5count5whereSiSb7ElementQzqd__YKXE_tqd__YKs5ErrorRd__lF What are these?
    FNV24 hash
    5B5O1

    Parameters

    predicate

    A closure that takes each element of the sequence as its argument and returns a Boolean value indicating whether the element should be included in the count.

    Returns

    The number of elements in the sequence that satisfy the given predicate.

    You can use this method to count the number of elements that pass a test. The following example finds the number of names that are fewer than five characters long:

    let names = ["Jacqueline", "Ian", "Amy", "Juan", "Soroush", "Tiffany"]
let shortNameCount = names.count(where: { $0.count < 5 })
// shortNameCount == 3

    To find the number of times a specific element appears in the sequence, use the equal to operator (==) in the closure to test for a match.

    let birds = ["duck", "duck", "duck", "duck", "goose"]
let duckCount = birds.count(where: { $0 == "duck" })
// duckCount == 4

    The sequence must be finite.