Default parameter values in SASS - Practice Problems & Coding Challenges

Challenge - 5 Problems

📝 Syntax

intermediate

What is the output CSS of this SASS code with default parameter?

Consider this SASS function with a default parameter. What CSS color will the .box class have?

SASS

@function set-color($color: blue) {
  @return $color;
}

.box {
  color: set-color();
}

A

.box {
  color: blue;
}

B

.box {
  color: null;
}

C

.box {
  color: $color;
}

D

.box {
  color: black;
}

💡 Hint

If no argument is given, the default value is used.

The function uses the default parameter value 'blue' when no argument is passed, so the color is blue.

🧠 Conceptual

intermediate

What happens if you override a default parameter in a mixin?

Given this mixin with a default parameter, what color will the .alert class have?

SASS

@mixin alert-color($color: red) {
  color: $color;
}

.alert {
  @include alert-color(green);
}

A

.alert {
  color: red;
}

B

.alert {
  color: green;
}

C

.alert {
  color: null;
}

D

.alert {
  color: $color;
}

💡 Hint

Passing an argument overrides the default value.

The mixin uses the passed argument 'green' instead of the default 'red', so the color is green.

❓ rendering

advanced

What is the rendered CSS output of this nested mixin with default parameters?

Analyze this SASS code with nested mixins and default parameters. What CSS will be generated for .card?

SASS

@mixin border-style($width: 1px, $color: black) {
  border: $width solid $color;
}

@mixin card-style($border-width: 2px) {
  @include border-style($border-width);
  padding: 1rem;
}

.card {
  @include card-style();
}

A

.card {
  border: 1px solid 1px;
  padding: 1rem;
}

B

.card {
  border: 1px solid black;
  padding: 1rem;
}

C

.card {
  border: 2px solid black;
  padding: 1rem;
}

D

.card {
  border: 2px solid 2px;
  padding: 1rem;
}

💡 Hint

The outer mixin overrides the first default parameter but not the second.

The card-style mixin passes 2px as the first argument to border-style, so border width is 2px and color uses default black.

❓ selector

advanced

Which option shows the correct CSS output for this SASS function with default parameter and conditional?

This SASS function returns a font size based on a parameter with a default. What CSS will h1 have?

SASS

@function font-size($level: 3) {
  @if $level == 1 {
    @return 2rem;
  } @else if $level == 2 {
    @return 1.5rem;
  } @else {
    @return 1rem;
  }
}

h1 {
  font-size: font-size();
}

A

h1 {
  font-size: null;
}

B

h1 {
  font-size: 2rem;
}

C

h1 {
  font-size: 3rem;
}

D

h1 {
  font-size: 1rem;
}

💡 Hint

Default parameter is 3, which triggers the else case.

Since the default $level is 3, the else block returns 1rem for font size.

❓ accessibility

expert

How does using default parameter values in SASS mixins improve accessibility and maintainability?

Choose the best explanation of how default parameters in SASS mixins help create accessible and maintainable CSS.

A They allow setting fallback styles that ensure consistent appearance even if no arguments are passed, helping maintain readable and accessible design.

B They prevent any CSS from being generated if parameters are missing, avoiding broken styles.

C They automatically add ARIA attributes to HTML elements for screen readers.

D They force all parameters to be passed explicitly, reducing errors in CSS.

💡 Hint

Think about how default values help keep styles consistent and predictable.

Default parameters provide fallback values so styles remain consistent and accessible even if no arguments are given, improving maintainability and user experience.