Swiftpack.co - Package - pumperknickle/AwesomeDictionary

Awesome Dictionary

Awesome Dictionary is a pure Swift implementation of a Dictionary or an abstract data type composed of a collection of (key, value) pairs, such that each possible key appears at most once in the collection. Instead of using hash tables, it uses a radix trie, which is essentially a compressed trie.


  1. Functional
  • All operations create new objects.
  • All mappings in AwesomeDictionary are immutable.
  1. Generic
  • Can be used with any Key type that conforms to BinaryEncodable.
  • Can be used with any Value type that conforms to Codable.
  1. Deterministic
  • Two dictionaries with the same key value pairs are guaranteed to be the same.
  • Two dictionaries with the same key value pairs are guaranteed to serialized the same byte for byte.
  1. Efficient
  • Modify existing dictionaries efficiently and functionally.
  1. Codable
  • Easily serializable to and from JSON and other encodings.


Swift Package Manager

Add AwesomeDictionary to Package.swift and the appropriate targets

dependencies: [
.package(url: "https://github.com/pumperknickle/AwesomeDictionary.git", from: "0.0.1")



Use AwesomeDictionary by including it in the imports of your swift file

import AwesomeDictionary


Create an empty generic mapping

let newMapping = Mapping<String, [[String]]>()


Use subscript to get the value of a key.

let value = newMapping["foo"]


When setting, a new structure is returned with the new key value pair inserted.

let modifiedMap = newMapping.setting(key: "foo", value: [["fooValue"]])


When deleting, a new structure is returned with the entry corresponding to the key deleted.

let modifiedMap = newMapping.deleting(key: "foo")


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