Hi Kossinus, the example code snippet is creating a new selector everytime when you call `selectLoading`, so the result is not memorized as expected (I should have updated the snippet as it was a fixed issue long time ago...).

To make it work, you need to create a selector that accepts arguments instead of creating selectors dynamically. refer: https://github.com/reduxjs/reselect#q-how-do-i-create-a-selector-that-takes-an-argument