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06-selectors #9

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06-selectors #9

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12 changes: 12 additions & 0 deletions src/app/shared/state/books.reducer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -63,3 +63,15 @@ export const booksReducer = createReducer(
export function reducer(state: State | undefined, action: Action) {
return booksReducer(state, action);
}

export const selectAll = (state: State) => state.collection;
export const selectActiveBookId = (state: State) => state.activeBookId;
export const selectActiveBook = createSelector(
selectAll,
selectActiveBookId,
(books, activeBookId) => books.find(book => book.id === activeBookId) || null
);
export const selectEarningsTotals = createSelector(
selectAll,
calculateBooksGrossEarnings
);