Default parameter values in SASS - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a default parameter value in Sass?

A default parameter value is a value given to a function or mixin parameter that is used if no other value is provided when calling it.

beginner

How do you set a default parameter value in a Sass mixin?

You assign the value in the parameter list using a colon, like @mixin example($color: blue). If no color is passed, it uses blue.

beginner

What happens if you call a Sass function or mixin without providing a parameter that has a default value?

Sass uses the default value specified for that parameter automatically.

intermediate

Can default parameter values in Sass be expressions or variables?

Yes, default values can be variables or expressions, like $size: 10px * 2 or $color: $primary-color.

beginner

Why are default parameter values useful in Sass?

They let you write flexible mixins and functions that work with or without extra input, making your code easier to reuse and maintain.

How do you define a default parameter value in a Sass mixin?

A By calling the mixin with a value

B Using an equal sign, like <code>$color = red</code>

C Using a colon after the parameter name, like <code>$color: red</code>

D By setting the value inside the mixin body

In Sass, default parameter values are set with a colon, for example @mixin example($color: red).

What value does a Sass mixin use if you don't provide a parameter with a default value?

A It uses the default value specified

B It throws an error

C It uses null

D It uses the last value used

If no value is provided, Sass uses the default parameter value defined in the mixin or function.

Can default parameter values in Sass be variables?

A No, only fixed values are allowed

B Only numbers can be used

C Only colors can be used

D Yes, variables can be used as default values

Sass allows variables to be used as default parameter values, making code flexible.

Which of these is a correct Sass mixin with a default parameter?

A @mixin box-shadow($shadow = 2px 2px 5px gray) { box-shadow: $shadow; }

B @mixin box-shadow($shadow: 2px 2px 5px gray) { box-shadow: $shadow; }

C @mixin box-shadow($shadow) { box-shadow: $shadow; }

D @mixin box-shadow { box-shadow: 2px 2px 5px gray; }

Option B correctly sets a default parameter value using a colon.

Why use default parameter values in Sass?

A To allow mixins and functions to work with or without extra input

B To make mixins and functions less flexible

C To avoid writing any parameters

D To force users to always provide values

Default parameter values let your code work smoothly whether or not you provide extra input.

Explain how default parameter values work in Sass mixins and why they are helpful.

Think about how you can write mixins that don’t always need all inputs.

Describe a simple Sass mixin with a default parameter and what happens when you call it with and without that parameter.

Imagine a button color that changes if you give a color, or stays default if you don’t.