Read the tutorial and learn the jQuery method of centering the <div> element on the screen. Get a code snippet to add your script for centering the element.
In this tutorial, you will read and learn about jQuery methods that are used to change the selected value of a drop-down list via its text description.
This tutorial provides the method of checking whether the type of the variable is undefined. Read about the differences between undefined and “undefined”.
You can either loop through the arrays or convert them to string and then compare. This tutorial provides several fast methods of comparing two arrays.