SuperDuperFilter.swift

// This is a generic filter
typealias Filter<T> = (T) -> Bool

// This is a simplified entry
struct Entry {
    let title: String
}

// This is a tiny helper function that returns a filter
// that takes an entry and checks if the title starts with the 
// provided string
func start(with prefix: String) -> Filter<Entry> {
    return { $0.title.starts(with: prefix) }
}

// This is a list of filters I want to apply on a list of entry
let defaultFilters = [start(with: "Marvel")]

// This is my list of entries
let entries = ["Marvel Cinematic Universe", "DC Cinematic Universe", "Some Other Universe"]

// This is a collection of filters that I want to apply on each entry
// Ideally, I'd want to make it generic so I can use it with other 
// things than entries.
// How can I make `Entry` generic? 
extension Array where Element == Filter<Entry> {
    func matches(on entry: Entry) -> Bool {
        return reduce(false, { acc, filter in acc || filter(entry) })
    }
}