ReactJS Quiz

What is the best definition of React.js?

• Server-side Framework

• User-interface framework

• A Library for building interaction interfaces

• None of These

What is the purpose of using JSX in React?

• To style components

• To make API calls

• To describe what the UI should look like

• To manage state

In React.js, how we can pass the data from one component to another in React.js?

• SetState

• Render with arguments

• Props

• PropTypes

How does data flow naturally in React apps?

• From parents to children

• From children to parents

• Both ways

• The developers decides.

Which of the following is true about key props?

• "Key" props are used to look beauty

• "Key" prop is a way to identify the newly added element

• It is one type of attribute of HTML

• It is not used in the array

An effect will always run on the initial render.

• True

• It depends on the dependency array

• False

• In depends on the code in the effect

What triggers a UI re-render in React?

• Running an effect

• Passing props

• Updating state

• Adding event listeners to DOM elements

What's the fundamental building block of React apps?

• Components

• Blocks

• Elements

• Effects

What is the most likely preferred port number on which the application runs?

• 3000

• 8080

• 5000

• 3030

Which of the following is a way to handle data in React.js?

• State & Props

• Services & Components

• State & Services

• State & Component