How to Sum Values of SASS Variables Using the var() Function in CSS

Описание: Discover how to sum values of SASS variables with the `var()` function using the `calc()` method for seamless CSS styling.
---
This video is based on the question https://stackoverflow.com/q/68427979/ asked by the user 'Gabri Rodríguez' ( https://stackoverflow.com/u/9438006/ ) and on the answer https://stackoverflow.com/a/68429674/ provided by the user 'Gabri Rodríguez' ( https://stackoverflow.com/u/9438006/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Sum values ​of SASS variables with var() function

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Sum Values of SASS Variables Using the var() Function in CSS

When working with modern CSS, particularly SASS, it can sometimes feel like you're running into a wall when trying to perform operations on CSS variables. A common scenario is needing to sum values of CSS variables retrieved from a SASS file using the var() function. Let's dive into the issue at hand and break down an effective solution.

The Problem

Suppose you're trying to import some CSS variables defined in a :root selector from a SASS file into another stylesheet. Here's a quick look at what we have in our root.module.scss file:

[[See Video to Reveal this Text or Code Snippet]]

You want to apply these variables together in your home.module.scss like this:

[[See Video to Reveal this Text or Code Snippet]]

Unfortunately, this line doesn't produce the desired result. Instead of summing the values of --app-padding and --header-height, it just concatenates the values as strings. Furthermore, if you attempt to combine them with a plus sign inside the var() function:

[[See Video to Reveal this Text or Code Snippet]]

This will also lead you to a compilation error, showcasing the limitations of the var() function when dealing with arithmetic operations directly.

The Solution: Use the calc() Function

The good news is that there is a seamless workaround to this problem — using the calc() function in CSS! The calc() function allows you to perform calculations directly in your CSS, making it possible to sum your variable values effectively.

Here’s How You Can Do It:

Instead of trying to sum your CSS variables with the var() function alone, wrap the addition operation in the calc() function. Here's the correct way to do it:

[[See Video to Reveal this Text or Code Snippet]]

Why This Works:

calc() Function: This built-in CSS function can handle basic arithmetic operations including addition, subtraction, multiplication, and division.

Dynamic Values: By using calc(), you maintain flexibility as calc() can manage dynamic values, making it perfect for responsive designs.

Visual Representation:

Here’s what the final CSS would look like visually represented:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In summary, if you find yourself needing to sum CSS variables imported via the var() function, remember to utilize the calc() function for proper calculations. This approach not only solves the problem but also enhances the flexibility of your CSS design. Happy styling!