Merge pull request #1296 from pguyot/w39/add-support-for-List.duplicate/2

Add support for Elixir `List.duplicate/2`

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

CHANGELOG.md

@@ -32,6 +32,7 @@ also non string parameters (e.g. `Enum.join([1, 2], ",")`
 - Support for `io:put_chars/2`
 - Support for `lists:nthtail/2`
 - Support for Elixir `IO.chardata_to_string/1`
+- Support for Elixir `List.duplicate/2`
 
 ### Changed
 

libs/exavmlib/lib/List.ex

@@ -147,6 +147,34 @@ defmodule List do
 
   @compile :inline_list_funcs
 
+  @doc """
+  Duplicates the given element `n` times in a list.
+
+  `n` is an integer greater than or equal to `0`.
+
+  If `n` is `0`, an empty list is returned.
+
+  ## Examples
+
+      iex> List.duplicate("hello", 0)
+      []
+
+      iex> List.duplicate("hi", 1)
+      ["hi"]
+
+      iex> List.duplicate("bye", 2)
+      ["bye", "bye"]
+
+      iex> List.duplicate([1, 2], 3)
+      [[1, 2], [1, 2], [1, 2]]
+
+  """
+  @spec duplicate(any, 0) :: []
+  @spec duplicate(elem, pos_integer) :: [elem, ...] when elem: var
+  def duplicate(elem, n) do
+    :lists.duplicate(n, elem)
+  end
+
   @doc """
   Deletes the given `element` from the `list`. Returns a new list without
   the element.