| import { useSelector } from 'react-redux' |
| import { createSelector } from 'reselect' |
|
|
| interface RootState { |
| todos: { |
| id: number |
| completed: boolean |
| title: string |
| description: string |
| }[] |
| alerts: { id: number; read: boolean }[] |
| } |
|
|
| const state: RootState = { |
| todos: [ |
| { |
| id: 0, |
| completed: false, |
| title: 'Figure out if plants are really plotting world domination.', |
| description: 'They may be.' |
| }, |
| { |
| id: 1, |
| completed: true, |
| title: 'Practice telekinesis for 15 minutes', |
| description: 'Just do it' |
| } |
| ], |
| alerts: [ |
| { id: 0, read: false }, |
| { id: 1, read: true } |
| ] |
| } |
|
|
| const selectTodoById = createSelector( |
| [(state: RootState) => state.todos, (state: RootState, id: number) => id], |
| (todos, id) => todos.find(todo => todo.id === id) |
| ) |
|
|
| export const createParametricSelectorHook = < |
| Result, |
| Params extends readonly unknown[] |
| >( |
| selector: (state: RootState, ...params: Params) => Result |
| ) => { |
| return (...args: Params) => { |
| return useSelector((state: RootState) => selector(state, ...args)) |
| } |
| } |
|
|
| export const useSelectTodo = createParametricSelectorHook(selectTodoById) |
|
|