AWS, JavaScript, React - Deploy Web Apps on the Cloud - React Lifecycle Events

The video tutorial explains key React lifecycle events, focusing on the useEffect hook. It covers how useEffect is used when a component first loads, with and without dependencies, and compares it to the componentDidUpdate event. The tutorial emphasizes the importance of understanding these concepts through code examples and prepares viewers for further exploration in upcoming videos.

What is the purpose of the 'useEffect' hook in React when a component first loads?

• To handle user input

• To update the component's state

• To manage component styling

• To perform side effects like data fetching

Why are square brackets used in the 'useEffect' hook with no dependencies?

• To define the component's initial state

• To list all the state variables

• To specify the effect should run on every render

• To indicate the effect should run only once

When does the 'componentDidUpdate' event trigger in a React component?

• When the component's state or props change

• When the component is unmounted

• When the component is first loaded

• When the component's style is updated

What is a dependency in the context of the 'useEffect' hook?

• A variable that determines when the effect should run

• A function that updates the component's state

• A CSS class applied to the component

• A method to fetch data from an API

How can changes in a state variable affect the 'useEffect' hook?

• They have no impact on the effect

• They prevent the effect from running

• They cause the component to unmount

• They trigger the effect to run again