object
, too. A useful tool for handling objects is the Object.assign()
utility. Object.assign()
takes a target object and source objects and maps properties from the source objects to the target object. Any matching properties are overwritten by properties in the source objects. This behavior is commonly used to make shallow copies of objects by passing an empty object as the first argument followed by the object(s) you want to copy. Here's an example:
const newObject = Object.assign({}, obj1, obj2);
This creates newObject
as a new object
, which contains the properties that currently exist in obj1
and obj2
.
object
for the state
. Edit the code to return a new state
object for actions with type ONLINE
, which set the status
property to the string online
. Try to use Object.assign()
to complete the challenge.
defaultState
object declared on line 1.
testString: 'assert((function() { const expectedState = { user: ''CamperBot'', status: ''offline'', friends: ''732,982'', community: ''freeCodeCamp'' }; const initialState = store.getState(); return DeepEqual(expectedState, initialState); })(), ''The Redux store should exist and initialize with a state that is equivalent to the defaultState
object declared on line 1.'');'
- text: wakeUp
and immutableReducer
both should be functions.
testString: assert(typeof wakeUp === 'function' && typeof immutableReducer === 'function', 'wakeUp
and immutableReducer
both should be functions.');
- text: Dispatching an action of type ONLINE
should update the property status
in state to online
and should NOT mutate state.
testString: 'assert((function() { const initialState = store.getState(); const isFrozen = DeepFreeze(initialState); store.dispatch({type: ''ONLINE''}); const finalState = store.getState(); const expectedState = { user: ''CamperBot'', status: ''online'', friends: ''732,982'', community: ''freeCodeCamp'' }; return isFrozen && DeepEqual(finalState, expectedState); })(), ''Dispatching an action of type ONLINE
should update the property status
in state to online
and should NOT mutate state.'');'
- text: Object.assign
should be used to return new state.
testString: getUserInput => assert(getUserInput('index').includes('Object.assign'), 'Object.assign
should be used to return new state.');
```