Maps are the go-to key/value data structure in Elixir. They have good performance at all sizes.
Let’s play with the Map API:[16]
| | iex> map = %{ name: "Dave", likes: "Programming", where: "Dallas" } |
| | %{likes: "Programming", name: "Dave", where: "Dallas"} |
| | iex> Map.keys map |
| | [:likes, :name, :where] |
| | iex> Map.values map |
| | ["Programming", "Dave", "Dallas"] |
| | iex> map[:name] |
| | "Dave" |
| | iex> map.name |
| | "Dave" |
| | iex> map1 = Map.drop map, [:where, :likes] |
| | %{name: "Dave"} |
| | iex> map2 = Map.put map, :also_likes, "Ruby" |
| | %{also_likes: "Ruby", likes: "Programming", name: "Dave", where: "Dallas"} |
| | iex> Map.keys map2 |
| | [:also_likes, :likes, :name, :where] |
| | iex> Map.has_key? map1, :where |
| | false |
| | iex> { value, updated_map } = Map.pop map2, :also_likes |
| | {"Ruby", %{likes: "Programming", name: "Dave", where: "Dallas"}} |
| | iex> Map.equal? map, updated_map |
| | true |