array enumerate

src/ytdl_sub/script/functions/array_functions.py

@@ -50,6 +50,16 @@ class ArrayFunctions:
     @staticmethod
     def array_apply(array: Array, lambda_function: Lambda) -> Array:
         """
-        Reverse an Array.
+        Apply a lambda function on every element in the Array.
         """
         return ResolvedArray([ResolvedArray([val]) for val in array.value])
+
+    @staticmethod
+    def array_enumerate(array: Array, lambda_function: Lambda) -> Array:
+        """
+        Apply a lambda function on every element in the Array, where each arg
+        passed to the lambda function is ``idx, element`` as two separate args.
+        """
+        return ResolvedArray(
+            [ResolvedArray([Integer(idx), val]) for idx, val in enumerate(array.value)]
+        )

src/ytdl_sub/script/types/function.py

@@ -28,7 +28,8 @@ from ytdl_sub.script.types.variable import FunctionArgument
 from ytdl_sub.script.types.variable import Variable
 from ytdl_sub.script.types.variable_dependency import VariableDependency
 from ytdl_sub.script.utils.exception_formatters import FunctionArgumentsExceptionFormatter
-from ytdl_sub.script.utils.exceptions import FunctionDoesNotExist, UNREACHABLE
+from ytdl_sub.script.utils.exceptions import UNREACHABLE
+from ytdl_sub.script.utils.exceptions import FunctionDoesNotExist
 from ytdl_sub.script.utils.exceptions import FunctionRuntimeException
 from ytdl_sub.script.utils.exceptions import UserThrownRuntimeError
 from ytdl_sub.script.utils.type_checking import FunctionInputSpec

tests/unit/script/types/test_function.py

@@ -127,8 +127,6 @@ class TestFunction:
             {
                 "%times_three": "{%mul($0, 3)}",
                 "%times_two": "{%mul($0, 2)}",
-                "wip": "{%array_apply([1, 2, 3], %if(False, %times_two, %times_three))}"
+                "wip": "{%array_apply([1, 2, 3], %if(False, %times_two, %times_three))}",
             }
-        ).resolve() == {
+        ).resolve() == {"wip": ResolvedArray([Integer(3), Integer(6), Integer(9)])}
-            "wip": ResolvedArray([Integer(3), Integer(6), Integer(9)])
-        }