Global Variables

Global Data Storage

In today’s post, I want to address the usage of global variables. Global variables are variables that can be accessed from anywhere, hence the term, ‘global’. So every piece of code, every function, can access a global variable. Because of this, it is a good practice to have as few global variables as possible. This helps protect your data and in OOP circles is known as encapsulation. That being said, there are times when you need a global variable.

Imagine you have a program and want to keep track of the status of that program. You could create a global status variable to house the data to check on the status. Say, for example, you are requesting that the user put in their age. You could have a variable entitled, “userAge” and set the initial value to -1. Setting it to negative one allows you to test to see if the value has been set with an if statement because nobody is -1 years of age (excluding your annoying little brother).

Many times, booleans are used in this manner. Imagine that you have a form where the user is registering for your site. You have certain restrictions on the password. You can have a global variable set to false. When the end user finishes typing in their password information, you can test the user-supplied info against your requirements. If it passes, then you can set your password checking global variable to true. You can then use this global status variable to check to see if it is ok to submit the form.

So, bottom-line…try to keep global variables to a minimum, but do not hesitate to use them if necessary.

Happy Coding!

Clay Hess

More To Explore

computer, laptop, work place-2982270.jpg
Code

Unlocking Wireless Communication: A Dive into the Bluetooth API

Wireless communication has become an integral part of our daily lives, and Bluetooth technology is at the forefront of this revolution, enabling devices to exchange data over short distances and creating a world more interconnected than ever before. At the heart of this technology lies the Bluetooth Application Programming Interface (API), a powerful tool for developers looking to harness the capabilities of Bluetooth in their applications. In this blog post, we’ll explore what the Bluetooth API is, how it works, and the possibilities it opens up for innovation in wireless communication.

lighthouse, beacon, atlantic-8578318.jpg
Code

Understanding the Beacon API: Simplifying Asynchronous Data Transfers

In today’s data-driven world, web applications often need to send data back to the server. Traditionally, this has been done using AJAX requests or similar methods. However, these techniques can come with a cost, especially when dealing with data that needs to be sent during the unload phase of a document, such as tracking and diagnostic data. This is where the Beacon API shines by allowing developers to send data to a server more reliably and efficiently.

Share This Post

small_c_popup.png

Need help?

Let's have a chat...


Login

Jump Back In!

Here at Webolution Designs, we love to learn. This includes sharing things we have learned with you. 

Register

Begin Your Learning Journey Today!

Come back inside to continue your learning journey.