Reselect: how to cache data written to reducer?

Question

JavaScript

I try reselect and the problem immediately arose: data polling works. Almost every time the same data arrives in the reducer - the component rerenders using this data. I try to cache this data using the selector - it doesn't work - the rerender still happens. What is wrong in this code?

function getAllTickets(reducer) {
    return reducer.get('tickets');
}

export const allTicketsSelector = createSelector([getAllTickets], items => items);

Answer 1

By default, createSelector uses the shallow comparison function. If you want to do a deep comparison, use createSelectorCreator and your comparison function. There is an example in the documentation .