How many WebSocket events are available?

Which operator is used to check if a particular property exists or not?

How many properties are associated with the Response event in web performance monitoring?

What does the Minify process return to the script tag?

How can you clone an element?

What is the output of the following JavaScript code?

function demo()
{
 var first_variable = "";
 document.getElementById("first_function").innerHTML = Boolean(first_variable);
}

Which component in a Redux application keeps track of all the registered reducers and exposes a reduce() function?

What will be the output of the following code snippet?

<script type="text/javascript"> var a=20; var b=7; var result = eval("a+b"); document.write(result); </script>

  The basic purpose of the toLocaleString() is to _________