React

What is ReactJS?

• User-interface framework

• Library for building interaction interfaces

• Server side Framework

React is mainly used for building :

• Database

• Connectivity

• Node application

• User Interface

___ can be done while multiple elements need to be returned from a component.

• Packing

• Abstraction

• Wrapping

What is used to pass data to a component from outside?

• setState

• conditional rendering

• props

• PropTypes

Which of the following methods in a React Component is called after the component is rendered for the first time?

• componentDidUpdate

• componentDidMount

• componentUpdate

• componentRender

Which of the following is the correct syntax for a button click event handler foo? (using functional component)

• <button onclick={this.foo()}>

• <button onclick={() => foo}>

• <button onClick={() => foo}>

What is a state in React?

• A persistent storage.

• An internal data store (object) of a component.

What are the two ways that data gets handled in React?

• state & props

• services & components