There are many programming languages, and each of them has its own fans, with different features that you need to become more familiar with as a programmer, one of these programming languages ​​that has many fans among users is CSS, which as you know, in this language, there are various features, each of which is used by different programmers in order to be able to do programming as good as possible .Although Cascading Style Sheets can meet the needs of a programmer, it is still necessary to use Sass if necessary to import very complex code and also to maintain it as well as possible, which is briefly explained below. Let's talk about language and how to work with Directives Expressions commands .

What is Sass?

Sass stands for Syntactically Awesome Style Sheets , and in simple terms it acts like an extension for CSS and works in such a way that you can use more features.With the help of Syntactically Awesome Style Sheets, it is possible for you to create style sheets very quickly and also helps you to be able to keep everything organized, which you can encourage you to install it, and in addition to the mentioned feature, it also has more positive points.The important thing about it, is that it is compatible with all versions of CSS, the most direct way to make this happen is in your terminal, once Sass is installed, you can compile your Sass to CSS using the sass command, you will need to tell Sass which file to build from, and where to output CSS to, for instance, running sass input.scss output.css from your terminal would take a single Sass file, input.scss, and compile that file to output.css.

Control Directives & Expressions:

In this section, we are going to explain the control directives briefly, which are in fact powerful tools, these commands are being commonly used in mixins and they are not being used in everyday designs.Another case in which control directives are being used are parts of the mixin that belong to the Compass library and therefore require a lot of flexibility.We also need to remind you that with the help of these commands, you can use the same style several times with different changes, and finally speed up your work, in the following some of the available expressions are going to be mentioned.

- Sass if () function:

This command examines whether the submitted condition is valid or not, if it is not valid, it examines the next condition and finally returns one of the two possible results as an output.This command has many uses which are also of a great importance, and different programmers try to create appropriate programs by mastering this section with the help of appropriate and good codes, to be able to create programs that users get a positive user experience after using them, now consider the following example for a better understanding: 

Read more on:https://www.dotnek.com/Blog/Web/learning-to-work-with-directives-expressions

link:https://dotnek.mystrikingly.com/

Related link:DotNek Android Development