React right here~

JSX is necessary to work with React.js?

• True

• False

React is mainly for building ___

• Database

• Connectivity

• User interface

• Design Platform

Which is used to keep the value of components unique?

• Ref

• Key

• store

• Data

• useEffect(() => { setDone(true); });

• useEffect(() => { setDone(true); }, []);

• useEffect(() => { setDone(true); }, [setDone]);

• useEffect(() => { setDone(true); }, [done, setDone]);

• Remove this

• Capitalize clock

• Remove the render method

• Add quotes around the return value

Why might you use a ref?

• to directly access the DOM node

• to refer to another JS file

• to bind the function

• to call a function

• {{name: "Venkat", age: 30}}

• {name: "Venkat", age: 30}

• {person: "Venkat", person: 30}}

• {person: {name: "Venkat", age: 30}}

• Error. Cannot use direct JavaScript code in JSX

• Error. Should be replaced with a for..loop for correct output

• Displays the list of languages in the array

• Displays nothing

What does this React element look like given the following function?

React.createElement('h1', null, "What's happening?");

• <h1 props={null}>What's happening?</h1>

• <h1>What's happening?</h1>

• <h1 id="component">What's happening?</h1>

• <h1 id="element">What's happening?</h1>

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'}}