Find the output of the following JavaScript code.

var str = "Example, JavaScript, Test";
var res = str.substring(6,15);
document.write(res);

What will the function NaN return for the condition NaN == NaN?

Which statement regarding let in JavaScript is not correct?

In relation to JavaScript prototype, which method is used for returning an array of all own property names?

Analyze the code using the source property of Regular Expressions. What's the output?

Which code snippet will create plugins back-end page without showing it as menu item?

Which functions are used to add administration menu item in WordPress ?

Which will correctly add custom mod rewrite rules to .htaccess from a WordPress plugin?

Which code snippet can be used to create custom POST status in wordpress 3.0 +?

Which is an example of a WordPress plugin that provides multilingual capabilities?