# How to use "Change app variable ...by" if the variable is a list **URL:** \ **Category:** Questions about Thunkable X\ **Created:** [May 20, 2025, 6:20am UTC](https://community.thunkable.com/t/how-to-use-change-app-variable-by-if-the-variable-is-a-list/3846991 "2025-05-20T06:20:01Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![anandavardhana57zwwl](https://avatars.discourse-cdn.com/v4/letter/a/8baadc/32.png) [@anandavardhana57zwwl](https://community.thunkable.com/u/anandavardhana57zwwl)\ **Post date:** [May 20, 2025, 6:20am UTC](https://community.thunkable.com/t/how-to-use-change-app-variable-by-if-the-variable-is-a-list/3846991/1 "2025-05-20T06:20:01Z")
> **[Thunkable](https://x.thunkable.com/copy/b1c6447def7f84400449027486fa207e)** Must be a very simple one but I just cant get it. Basically I should get the answer 8+1=9. Please advice. Thanks ananda ---
**Author:** ![anandavardhana57zwwl](https://avatars.discourse-cdn.com/v4/letter/a/8baadc/32.png) [@anandavardhana57zwwl](https://community.thunkable.com/u/anandavardhana57zwwl)\ **Post date:** [May 20, 2025, 2:04pm UTC](https://community.thunkable.com/t/how-to-use-change-app-variable-by-if-the-variable-is-a-list/3846991/2 "2025-05-20T14:04:09Z")
It seems incrementing an List app variable is not supported by Thunkable. The workaround @ioannis suggested works fine. Index #2 becomes 9. Thanks @ioannis ![image](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/4/6/46302ac8158b70420a905240ec057c2e5e6e947e.png) ---
**Author:** ![system](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/0/f/0f59f292712368bce16ff80133ae10de8a6f27e8.png) [@system](https://community.thunkable.com/u/system)\ **Post date:** [August 18, 2025, 2:04pm UTC](https://community.thunkable.com/t/how-to-use-change-app-variable-by-if-the-variable-is-a-list/3846991/3 "2025-08-18T14:04:43Z")
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