A block-based approach to inflating an array into a dictionary.

MapToDictionary.swift

extension Array {
  func mapToDictionary<Key:Hashable,Value>(mapBlock: (Element)->(Key,Value)) -> [Key:Value] {
    var dict = [Key:Value]()
    self.forEach { (element) in
      let kvTuple: (Key,Value) = mapBlock(element)
      dict[kvTuple.0] = kvTuple.1
    }
    return dict
  }
}