home-works/src/s2-homeworks/hw08/bll/homeWorkReducer.ts

import { UserType } from '../HW8'

type ActionType =
    | { type: 'sort'; payload: 'up' | 'down' }
    | { type: 'check'; payload: number }

export const homeWorkReducer = (
    state: UserType[],
    action: ActionType
): UserType[] => {
    // need to fix any
    switch (
        action.type // делают студенты
    ) {
        case 'sort': {
            const newState = [...state].sort((a, b) => {
                if (a.name > b.name) return 1
                else if (a.name < b.name) return -1
                else return 0
            })

            return action.payload === 'up' ? newState : newState.reverse()
        }
        case 'check': {
            return state.filter((a) => a.age >= action.payload)
        }
        default:
            return state
    }
}