Add List_extend()

src/list.c

@@ -69,6 +69,7 @@ int List_append(List *list, int element) {
         }
         list->_array = temp;
     }
+
     list->_array[++list->_currentSize] = element;
 
     return 0;
@@ -251,6 +252,21 @@ List *List_slice(List *list, int start_index, int end_index) {
     return slicedList;
 }
 
+int List_extend(List *list_to_extend, List *input_list) {
+    if (!list_to_extend || !input_list) {
+        return 1;
+    }
+
+    for (int i = 0; i < input_list->_currentSize + 1; i++) {
+        int returnCode = List_append(list_to_extend, List_get(input_list, i));
+        if (returnCode != 0) {
+            return returnCode;
+        }
+    }
+
+    return 0;
+}
+
 int List_length(List *list) {
     return list->_currentSize + 1;
 }

src/list.h

@@ -198,6 +198,29 @@ int List_clear(List *list);
  */
 List *List_slice(List *list, int start_index, int end_index);
 
+/*
+ *
+ * Description
+ * ----------------------------
+ *  Extend the given list_to_extend with elements from given input_list
+ *
+ * Params
+ * ----------------------------
+ *  *list_to_extend     the list to extend with elements from input_list
+ *  *input_list         the list containing elements to insert into list_to_extend
+ *
+ *  Example
+ * ----------------------------
+ *  Given list1 -> [1, 2] AND list2 -> [3, 4, 5]
+ *  When List_extend(list1, list2);
+ *  Then list1 -> [1, 2, 3, 4, 5]
+ *
+ * Returns
+ * ----------------------------
+ *  int (0 for success, Non-0 for error)
+ */
+int List_extend(List *list_to_extend, List *input_list);
+
 /*
  *
  * Description

src/test/test.c

@@ -179,6 +179,28 @@ void shouldReverseList() {
     printSuccess(__func__);
 }
 
+void shouldExtendList() {
+    // Arrange
+    List *list_to_extend = List_new();
+    List *input_list = List_new();
+    List_append_all(list_to_extend, 2, 1, 2);
+    List_append_all(input_list, 3, 3, 4, 5);
+
+    // Act
+    int returnCode = List_extend(list_to_extend, input_list);
+
+    // Assert
+    assert(returnCode == 0);
+    assert(List_length(list_to_extend) == 5);
+    for (int i = 0; i < 5; i++) {
+        assert(List_get(list_to_extend, i) == i + 1);
+    }
+    List_destroy(&list_to_extend);
+    List_destroy(&input_list);
+
+    printSuccess(__func__);
+}
+
 int main() {
     printf("============================================");
     printf("\nSTART TESTING");
@@ -193,6 +215,7 @@ int main() {
     shouldInsertElementIntoListIndexZero();
     shouldRemoveElementFromList();
     shouldReverseList();
+    shouldExtendList();
     printf("\n\n============================================");
     printf("\nFINISH TESTING");
     printf("\n============================================");