React JS kvíz

Which is the most popular JavaScript framework?

• Angular

• React

• Svelte

• Vue

Which company invented React?

• Google

• Apple

• Netflix

• Facebook

What's the fundamental building block of React apps?

• Components

• Blocks

• Elements

• Effects

What's the name of the syntax we use to describe the UI in React components?

• FBJ

• Babel

• JSX

• ES2015

How does data flow naturally in React apps?

• From parents to children

• From children to parents

• Both ways

• The developers decides

How to pass data into a child component?

• State

• Props

• PropTypes

• Parameters

What triggers a UI re-render in React?

• Running an effect

• Passing props

• Updating state

• Adding event listeners to DOM elements

When do we directly "touch" the DOM in React?

• When we need to listen to an event

• When we need to change the UI

• When we need to add styles

• Almost never

Which hook to use for an API request on the component's initial render?

• useState

• useEffect

• useRef

• useReducer

Which variables should go into the useEffect dependency array?

• Usually none

• All our state variables

• All state and props referenced in the effect

• All variables needed for clean up