SASS (Syntactically Awesome Style Sheets) is a scripting language known as a CSS preprocessor. CSS preprocessors are compiled into CSS and by doing so, extend the default capabilities of CSS.

Sass makes authoring stylesheets faster, easier, and more flexible. It’s a welcome helper in the world of web design, because anyone that’s created a website knows that CSS is hard.

In this course, you will learn how to use nesting, variables, mixins, partials, functions and more to write dynamic and reusable styles of code. You’ll also learn the various methods to structure your projects and bring organization to your stylesheets.

By the end of this course, you’ll have advanced knowledge of SASS. You’ll be able to migrate an existing CSS codebase, as well as set up an entire project (and build process) from scratch.

Sass for CSS: Advanced Frontend Development

## Definition
Sass **functions** can receive arguments and return a single value. 

They add an element of programming to writing CSS code, and we can now do math!

The standard math operators ```+```, ```-```, ```*```, ```/```, and ```%``` can all be utilized.

## Example

The following function can accept two arguments, ```$first-number``` and ```$second-number```. The value that is returned by the function is the sum of the two variables:

```SASS
@function add-numbers($first-number, $second-number) {
  @return $first-number + $second-number
}
```
Say we want to replace the value of a ```padding``` property with the sum of two separate values. 

We would call our function and pass in the arguments like so:

```SASS
.box1 {
  padding: add-numbers(5px, 10px);
}
```

The resulting CSS output would be:
```CSS
.box1 {
  padding: 15px;
}
```

Try it out below!


# Definition
Sass **functions** can receive arguments and return a single value. 

They add an element of programming to writing CSS code, and we can now do math!

The standard math operators ```+```, ```-```, ```*```, ```/```, and ```%``` can all be utilized.

# Example

The following function can accept two arguments, ```$first-number``` and ```$second-number```. The value that is returned by the function is the sum of the two variables:

```SASS
@function add-numbers($first-number, $second-number) {
  @return $first-number + $second-number
}
```
Say we want to replace the value of a ```padding``` property with the sum of two separate values. 

We would call our function and pass in the arguments like so:

```SASS
.box1 {
  padding: add-numbers(5px, 10px);
}
```

The resulting CSS output would be:
```CSS
.box1 {
  padding: 15px;
}
```

Try it out below!


# Definition
Sass **functions** can receive arguments and return a single value. 

They add an element of programming to writing CSS code, and we can now do math!

The standard math operators ```+```, ```-```, ```*```, ```/```, and ```%``` can all be utilized.

# Example

The following function can accept two arguments, ```＄first-number``` and ```＄second-number```. The value that is returned by the function is the sum of the two variables:

```SASS
@function add-numbers($first-number, $second-number) {
  @return $first-number + $second-number
}
```
Say we want to replace the value of a ```padding``` property with the sum of two separate values. 

We would call our function and pass in the arguments like so:

```SASS
.box1 {
  padding: add-numbers(5px, 10px);
}
```

The resulting CSS output would be:
```CSS
.box1 {
  padding: 15px;
}
```

Try it out below!


In this lesson, we'll be looking at how to write functions in SASS.

Starting with SASS

SASS Features

Structuring your SASS Projects

Setting up a SASS Build Process

Bonus: Setting up Media Queries with SASS Mixins

Appendix

Functions

Definition #

Example #