freeCodeCamp/guide/english/certifications/front-end-libraries/redux/copy-an-object-with-object.assign/index.md

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title: Copy an Object with Object.assign
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# Copy an Object with Object.assign

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## Problem Explanation
The goal of this challenge is to enforce state immutability when state is an object. 


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## Hints

### Hint 1
Use the method ```Object.assign({}, obj1, obj2)``` in return. Pass ```state``` as obj1. 

### Hint 2
The obj2 should be the updated ```{key: value}``` pair of your state.


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## Solutions

<details><summary>Solution 1 (Click to Show/Hide)</summary>

```javascript
const defaultState = {
  user: "CamperBot",
  status: "offline",
  friends: "732,982",
  community: "freeCodeCamp"
};

const immutableReducer = (state = defaultState, action) => {
  switch (action.type) {
    case "ONLINE":
      // to enforce state immutability, return a new state object using Object.assign() method
      return Object.assign({}, state, { status: "online" });
    default:
      return state;
  }
};

const wakeUp = () => {
  return {
    type: "ONLINE"
  };
};

const store = Redux.createStore(immutableReducer);
```
</details>