React (The Last Act)

What do you call the message wrapped in curly braces below?

let message = 'Hi there';

const element = <p>{message}</p>;

•  A JS function

• A JS element

• A JSX wrapper

• A JS expression

Which of the following is not a disadvantage of React.js?

• React.js has only a view layer. We have put your code for Ajax requests, events and so on.

• The library of React.js is pretty large.

• The JSX in React.js makes code easy to read and write.

• The learning curve can be steep in React.js.

What would be the output of the following example?

var Helloworld=(props)=>  {  

 return(  

 <div>  

 Hello World 1  

 </div>  

 <div>  

 Hello World 2  

 </div>  

 );  

}  

ReactDOM.render(<Helloworld/>,mountNode)  

• Hello World 1

• Hello World 2

• Hello World 1 Hello World 2

• Error

How many numbers of elements a valid react component can return?

• 1

• 2

• 3

• 4

Which of the following is used to pass data to a component from outside in React.js?

•  SetState

• Render with arguments

• Props

•  PropTypes

What does ES6 stand for?

•  ECMAScript 6

• ECMA 6

• ECMAJavaScript 6

• EJavaScript 6

What is Babel?

•  A JavaScript transpiler

• A JavaScript interpreter

•  A JavaScript Compiler

•  None of the above

React is used mainly for building ........

• Database

• User interface

• Connectivity

• Design platform

Which function is used to change the state of react component?

• this.State{}

•  this.setState

• this.setChangeState

•  None of the Above

What do you call the message wrapped in curly braces below?

let message = 'Hi there';

const element = <p>{message}</p>;

• A JS function

• A JS element

•  A JSX wrapper

• A JS expression