Sequence Extensions

Sequence+Desmond.swift

public extension Sequence {
    func scan<T>(_ seed: T, function:(T, Iterator.Element) -> T) -> T {
        var current: T = seed
        
        for element in self {
            current = function(current, element)
        }
        
        return current
    }
}

extension Sequence {
    func count(_ shouldCount: (Iterator.Element) -> Bool) -> Int {
        var count: Int = 0
        
        for element in self {
            if shouldCount(element) {
                count += 1
            }
        }
        
        return count
    }
}