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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | 3x 3x 3x 1x 1x 1x 1x 3x 1x 1x 1x 1x 1x 1x | import { atom, selector } from "recoil"; export interface Todo { id: number; text: string; isDone: boolean; isEditable: boolean; } export const filterState = atom({ key: "filterState", default: "All" }); export const todoListState = atom({ key: "todoListState", default: [] as Todo[] }); export const filterTodoListState = selector({ key: "filterTodoListState", get: ({ get }) => { const filter = get(filterState); const list: Todo[] = get(todoListState); switch (filter) { case "Done": return list.filter(item => item.isDone); case "Active": return list.filter(item => !item.isDone); default: return list; } } }); export const todoStatsState = selector({ key: "todoStatsState", get: ({ get }) => { const list = get(todoListState); const all = list.length; const done = list.filter(item => item.isDone).length; const active = all - done; const donePercentage = all === 0 ? 0 : done * 100 / all; return { all, active, donePercentage }; } }) |