feat: quote, nth

builtins.c

@@ -193,3 +193,33 @@ int builtin_ceil(Nodes args, Scopes *scopes, Node *result) {
     result->as_number = ceil(args.items[0].as_number);
     return 0;
 }
+
+int builtin_nth(Nodes args, Scopes *scopes, Node *result) {
+    UNUSED(scopes);
+
+    if (args.count != 2) {
+        printf("'nth' expects two arguments!\n");
+        return 1;
+    }
+
+    Node node_idx = args.items[0];
+    if (node_idx.kind != NODE_KIND_NUMBER) {
+        printf("'nth' expects an index as the first argument!\n");
+        return 1;
+    }
+
+    Node node_list = args.items[1];
+    if (node_list.kind != NODE_KIND_LIST) {
+        printf("'nth' expects a list as the second argument!\n");
+        return 1;
+    }
+
+    uint64_t idx = node_idx.as_number;
+    if (idx >= node_list.as_list->count) {
+        printf("Index out of bounds!");
+        return 1;
+    }
+
+    *result = node_list.as_list->items[idx];
+    return 0;
+}