How do you return a new copy of state in Redux?

JavaScript
1

Link to the challenge:
https://learn.freecodecamp.org/front-end-libraries/redux/never-mutate-state

Right now I’m defining the state as a new variable, but the tests still say that I am mutating the state. What am I doing wrong in this challenge? Any help is appreciated :slight_smile:

My code so far:



const ADD_TO_DO = 'ADD_TO_DO';

// A list of strings representing tasks to do:
const todos = [
  'Go to the store',
  'Clean the house',
  'Cook dinner',
  'Learn to code',
];

const immutableReducer = (state = todos, action) => {
  switch(action.type) {
    case ADD_TO_DO:
      let newState =  state.push(action.todo);
      return newState;
      break;
    default:
      return state;
  }
};

// an example todo argument would be 'Learn React',
const addToDo = (todo) => {
  return {
    type: ADD_TO_DO,
    todo
  }
}

const store = Redux.createStore(immutableReducer);

Browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36.