REACT

One can define default values for properties, props, using which of the following method?

• getDefaultProps
• getPropsValue
• getInitialState

Life cycle methods of a components fall under following categories?

• Mounting, Unmounting
• Mounting, Updating
• Mounting, Updating, Unmounting

Which of the following API is a MUST for every ReactJS component?

• getInitialState
• render
• renderComponent
• None of the above

Which method is not part of ReactDOM?

• ReactDOM.destroy()
• ReactDOM.hydrate()
• ReactDOM.createPortal()
• ReactDOM.findDOMNode()

Which of the following API is a MUST for every ReactJS component?

• getInitialState
• render
• renderComponent
• None of the above

At the highest level, React components have lifecycle events that fall into

• Initialization
• State/Property Updates
• Destruction
• All of these

What happens when the following render() method executes?<br /><br /> render(){<br /> let langs = ["Ruby","ES6","Scala"]<br /> return (<div><br /> {langs.map(it => <p>{it}</p>)}<br /> </div>)<br /> }<br />

• Displays the list of languages in the array
• Error. Cannot use direct JavaScript code in JSX
• Displays nothing
• Error. Should be replaced with a for..loop for correct output

How do you write an inline style specifying the font-size:12px and color:red; in JSX

• style={{font-size:12,color:'red'}}
• style={{fontSize:'12px',color:'red'}}
• style={fontSize:'12px',color:'red'}
• style={{font-size:12px,color:'red'}}

Which of the following is correct syntax for a button click event handler, foo?

• <button onclick=this.foo()>
• <button onclick=this.foo>
• <button onClick={this.foo()}>
• <button onClick={foo}>

What function allows you to render React content in an HTML page?

• React.mount()
• ReactDOM.start()
• ReactDOM.render()
• React.render()