Advanced State with Reducers

Review, Research, and Discussion

• How can we ensure that an effect hook runs only once?

  • adding an empty [] after the callback function in useEffect()

• Can useState() update more than one state variable at the same time?

  • no, useState() should update one state variable at a time

• Is useState() synchronous?

  • no, it is asynchronous. It does not update the state immediately but have queues that are used to update the state object

Document the following Vocabulary Terms

• State Hook: special function that lets you “hook into” React features

• Component Lifecycle: there are four parts of a component’s lifecycle, initialization, mounting, updating, and unmounting

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