How to compare two variables a and b in JavaScript?

Which method or operator used to identify the array? 

How can the nodes in a node list be accessed?

Which are the correct Date object methods?

__________ is one of the hottest libraries for front-end development in today's marketplace.

How can you update the state of a React component?

Which method receives the return value of setInterval() to cancel future invocations?

To replace the <p> element with the <h2> element, which jQuery method should be used?

What will be the output?

console.log("B is " + typeof NaN + typeof "1");

What is the function used to deregister an event handler 'f'?