in the article React developer essential skills: master useReducer foundation and application , we discussed the basic knowledge of useReducer in React. In this article, we will discuss the advanced techniques of useReducer. This article will show you how to flexibly use useReducer to manage complex states within and between components in React programs through a more complex "task control component"-- the core operation component of task processing in TODO applications. implementation ideas in TODO applications, the core operation is the various processing logic of "task", including "add task", "delete task", "filter task", "search task" and so on. To make it easier to understand, we only implement the "add task" and "delete task" logic. at the same time, in order to facilitate us to later maintain and expand the function and logic of the "task" operation, we should package it into a separate component. In addition, the "add task" and "delete task" functions of the component should also be exposed for the parent component to call. subcomponents TaskControl this subcomponent should contain the following functions: use useReducer in the component to manage the task list and use useRef to create a reference to get the value of the input box. wraps the component with forwardRef so that the add task and delete task methods in the component can be called from the parent component. defines functions for add tasks and Delete tasks to update the task list. use useImperativeHandle to expose the add task and delete task functions to the parent component for calling. Let's take a look at the…