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import { createSelector, createStructuredSelector } from 'reselect'
export interface RootState {
todos: {
id: number
completed: boolean
title: string
description: string
}[]
alerts: { id: number; read: boolean }[]
}
// This:
export const structuredSelector = createStructuredSelector(
{
todos: (state: RootState) => state.todos,
alerts: (state: RootState) => state.alerts,
todoById: (state: RootState, id: number) => state.todos[id]
},
createSelector
)
// Is essentially the same as this:
export const selector = createSelector(
[
(state: RootState) => state.todos,
(state: RootState) => state.alerts,
(state: RootState, id: number) => state.todos[id]
],
(todos, alerts, todoById) => {
return {
todos,
alerts,
todoById
}
}
)
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