What are 'refs' in React?

Which of the following is a web application API framework?

The libraries that build a new higher-level API for client-side programming is ________ 

What is the only way to trigger a state change in a Redux application?

Which method is used to cancel future invocations of the function scheduled with setInterval()?

How to pick a document element based on the value of its id attribute? 

Which option of the draggable widget is used so that the element goes back to its previous position after we have dragged the element?

What is the purpose of the property PerformanceTiming.fetchStart?

When is an application said to have good runtime performance?

When is it recommended to pass this.setState as a function rather than an object?