Add All Values For A Key In A Keyword List as an elixir til

elixir/all-values-for-a-key-in-a-keyword-list.md

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+# All Values For A Key In A Keyword List
+
+A keyword list in Elixir can contain the same key multiple times.
+
+```elixir
+kwl = [a: 1, b: 2, a: 3, c: 4]
+#=> [a: 1, b: 2, a: 3, c: 4]
+```
+
+The `get/2` function will only grab the value of the first occurrence.
+
+```elixir
+Keyword.get(kwl, :a)
+#=> 1
+```
+
+You can use `get_values/2` to retrieve _all_ values associated with the key.
+
+```elixir
+Keyword.get_values(kwl, :a)
+#=> [1, 3]
+```