Which method is used to display a message in a dialog box? 

What is the value of the following script?

var a;

document.write(a);

The listener is the callback to be invoked any time an action has been dispatched.

What is the main difference between localStorage and sessionStorage?

What is the output of the following code?

<script>

var x = 57;

var y = true;

document.write(x / y);

</script>

What React feature provides a way to pass data through the component tree without having to pass props down manually at every level?

What is the correct syntax for referring to an external script called "file.js"?

 Which is a useful way to try out small and simple Rhino programs and one-liners? 

 What are the three important manipulations done in a for loop on a loop variable? 

What are the rules for any reducer passed to combineReducers?