freeCodeCamp/guide/english/elixir/keyword-lists/index.md

title
Keyword Lists

Keyword Lists

Keyword Lists are used for storing the key-value pairs as tuples.

iex(1)> iex(3)> kw_list = [{:key1, "Val1"}, {:key2, "Val2"}, {:key1, "It is OK to repeat key1"}]
[key1: "Val1", key2: "Val2", key1: "It is OK to repeat key1"]

curly braces can be omitted as seen in the iex response on the second line.

In Keyword Lists, the Keys :

• Must be atoms
• Can be repeated
• Are ordered as specified by the developer.

Keyword lists are default mechanism for passing options to functions in Elixir.

More Information:

• Elixir Documentation
• Keyword HexDocs