Opaque Return Types (some and any)

OpaqueReturnTypes.swift

import Foundation

// Basically opaque return types you delegate the
// inferring type to the compilator instead of defining
// explicitly its type.

// with some
func getData() -> some Collection {
    return [1, 2, 3, 4, 5]
}

// with any
func getAnotherData() -> any Collection {
    return Bool.random() ? [1, 2, 3, 4, 5] : ["one": 1, "two": 2]
}

// Notice that each variable type is only
// computed in compilation process, so before the compilation
// you don't know the variables specifically types.

let data = getData()
data.count

let anotherData = getAnotherData()
anotherData.count