How can I delet a single element from the array in redux state using redux toolkit - redux

Question

I am adding and deleting items in an array using the createSlice() function from the redux-toolkit library.
The addProject reducer function works fine but the removeRpoject doesn't work.
//projects.js
import { createSlice } from "#reduxjs/toolkit";
let lastId = 0;
const slice = createSlice({
name: "projects",
initialState: [],
reducers: {
projectAdded: (projects, action) => {
projects.push({
id: ++lastId,
name: action.payload.name,
});
},
projectRemoved: (projects, action) =>
(projects = projects.filter((pro) => pro.id !== action.payload.id)),
},
});
export const { projectAdded, projectRemoved } = slice.actions;
export default slice.reducer;
//store.js
import { configureStore } from "#reduxjs/toolkit";
import reducer from "./projects";
const store = configureStore({ reducer: reducer });
export default store;
//index.js
import store from "./store/store";
import { projectAdded, projectRemoved } from "./store/projects";
const unsubscribe = store.subscribe(() => {
console.log("store Changed", store.getState());
});
store.dispatch(projectAdded({ name: "Project 1" }));
store.dispatch(projectRemoved({ id: 1 }));

Answer 1

You are replacing the root object of your state (projects) - this kills the immer change detection.
The simplest way is to just return the filtered array without assigning it to the draft object first:
projectRemoved: (projects, action) => projects.filter((pro) => pro.id !== action.payload.id),
See also:
https://immerjs.github.io/immer/docs/update-patterns#array-mutations