When is addition Not Addition?

Share This Post

In programming, you will utilize math a lot…not complex math, but math none the less. So make sure you know addition, subtraction, division and multiplication. In this post, I want to address addition.

Of course, when you add two numbers together, you utilize the plus (+) symbol. With this particular operator, you have to be aware of the data types you are adding together. The plus (+) operator is used not only for addition, but also for concatenation, which is connecting two items together and making them one.

Let’s look at some examples.

First, plain addition…

[code lang=”js”]
// Declare two number variables and a total variable
var firstNum = 1;
var secondNum = 2;
var total = 0;
// Add two variables together and store them in the total
total = firstNum + secondNum;
// Output total to screen

The aforementioned code would result in the number ‘3’ being output to the screen.

Now, let’s look at concatenation…

[code lang=”js”]
// declare to string variables and a combined variable
var firstString = "Java";
var secondString = "Script";
var combinedString = "";
// Concatenate the two variables into one and store it in the combined variable
combinedString = firstString + secondString;
// Output code to the screen

The aforementioned could would result in the word “JavaScript” being output to the screen.

So why is this important to keep in mind? Well, sometimes a number is not a number. For example…

[code lang=”js”]
// Declare a variable with numbered value strings
var testVar = "1" + "2";
// Output the variable to the screen

The aforementioned code would result in the text number of “12” being output to the screen.

Now, sometimes, depending on the language, which I am using JavaScript, the language interpreter/compiler will attempt to make type adjustments on the fly. So depending on how you use the numbered string, it could result in a correct calculation. My recommendation is to always test to ensure you are using a number. For example, in JavaScript whenever you prompt the user for information, it always comes through as a string, even if they put in a number. You can use the Number() function to it from a string to an integer.

Happy Coding!

Clay Hess

More To Explore


Demystifying Scrum User Stories Confirmation: Ensuring Quality and Collaboration

One of the key elements of Scrum is the use of user stories to define the requirements of a system or feature from the perspective of the end user. As teams work through the product backlog, it becomes crucial to confirm the user stories to ensure they meet the desired criteria and are ready for development. In this blog post, we’ll explore the concept of Scrum user stories confirmation and its significance in delivering high-quality products.


The Power of Conversations in Scrum User Stories

At the heart of Scrum lies the concept of user stories, which serve as a means of capturing requirements from the perspective of end-users. However, the true power of user stories lies not just in their written form but also in the conversations that take place around them. In this blog post, we will explore the significance of conversations in Scrum user stories and how they contribute to the success of Agile projects.

Do You Want To Boost Your Business?

drop us a line and keep in touch

Scroll to Top

Need help?

Let's have a chat...


Jump Back In!

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


Begin Your Learning Journey Today!

Come back inside to continue your learning journey.