mapMaybe.swift

mapMaybe.swift

// Transform a list of values into a list of transformed values where the transformation might fail and produce an optional.
func mapMaybe<C : CollectionType, T>(array: C, transform: (C.Generator.Element -> T?)) -> [T] {
    var result = [T]()
    for element in array {
        if let transformed = transform(element) {
            result.append(transformed)
        }
    }
    return result
}

mapMaybe(["1", "hello", "2"], String.toInt)
// > [1, 2]