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