Swift 3 implementation of Kotlin's associateBy for transforming a Sequence to a Dictionary

Sequence_associateBy.swift

public
extension Sequence
{
    /// Returns a Dictionary using the result of `keySelector` as the key, and the result of `valueTransform` as the value
    public func associateBy<T, K: Hashable, V>(_ keySelector: (T) -> K, _ valueTransform: (T) -> V) -> [K:V] where T == Iterator.Element
    {
        var dict: [K:V] = [:]
        for element in self {
            dict[keySelector(element)] = valueTransform(element)
        }
        return dict
    }
}