Instance Methodswift-algorithms 1.2.0Algorithms->Swift

    uniqued(on:)

    Returns an array with the unique elements of this sequence (as determined by the given projection), in the order of the first occurrence of each unique element.

    Unique.swift:115
    func uniqued<Subject>(on projection: (Element) throws -> Subject) rethrows -> [Element] where Subject : Hashable
    Mangled symbol
    sST10AlgorithmsE7uniqued2onSay7ElementQzGqd__AEKXE_tKSHRd__lF What are these?
    FNV24 hash
    4V76M

    Parameters

    projection

    A closure that transforms an element into the value to use for uniqueness. If projection returns the same value for two different elements, the second element will be excluded from the resulting array.

    Returns

    An array with only the unique elements of this sequence, as determined by the result of projection for each element.

    This example finds the elements of the animals array with unique first characters:

    let animals = ["dog", "pig", "cat", "ox", "cow", "owl"]
let uniqued = animals.uniqued(on: { $0.first })
print(uniqued)
// Prints '["dog", "pig", "cat", "ox"]'