Advanced State with Reducers

Review, Research, and Discussion

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

If we pass an empty array [] , it just renders the component only once like componentDidMount

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

You can have multiple states inside of a single component: call multiple times useState()

3. Is useState() synchronous?

no , useState() doesn’t update value of the variable if called just after setting value.

Trems	DEF
State Hook	A Hook is a special function that lets you “hook into” React features. For example, useState is a Hook that lets you add React state to function components. We’ll learn other Hooks later.
Component Lifecycle	Every React Component has a lifecycle of its own, lifecycle of a component can be defined as the series of methods that are invoked in different stages of the component’s existence. … A React Component can go through four stages of its life as follows