@return statement in SASS - Practice Problems & Coding Challenges

Challenge - 5 Problems

📝 Syntax

intermediate

What is the output of this Sass function?

Consider the following Sass function that uses @return. What will be the value of $result after compilation?

SASS

@function double($n) {
  @return $n * 2;
}

$result: double(5);

A 25

B 5

C 10

D Error: Undefined variable

💡 Hint

The function returns the input number multiplied by 2.

The function double takes a number and returns it multiplied by 2 using @return. So, double(5) returns 10.

🧠 Conceptual

intermediate

What happens if a Sass function has no @return statement?

In Sass, what is the result when a function does not include an @return statement?

SASS

@function noReturn() {
  $x: 5;
  // no return here
}

$value: noReturn();

A Compilation error: missing @return statement.

B The function returns 0 by default.

C The function returns the last variable assigned, $x (5).

D The function returns null, so $value is null.

💡 Hint

Sass functions must explicitly return a value with @return.

If a Sass function does not have an @return statement, it returns null by default.

❓ rendering

advanced

What color will the text be after Sass compilation?

Given this Sass code using a function with @return, what color will the paragraph text have in the browser?

SASS

@function theme-color($mode) {
  @if $mode == light {
    @return #333333;
  } @else if $mode == dark {
    @return #eeeeee;
  } @else {
    @return #000000;
  }
}

p {
  color: theme-color(dark);
}

A The text color will be transparent.

B The text color will be #eeeeee (light gray).

C The text color will be #000000 (black).

D The text color will be #333333 (dark gray).

💡 Hint

Check which color is returned when the mode is 'dark'.

The function returns #eeeeee when the input is 'dark', so the paragraph text color will be light gray (#eeeeee).

❓ selector

advanced

Which Sass function call returns a list with three items?

Given the Sass function below, which call returns a list with exactly three items?

SASS

@function create-list($a, $b, $c) {
  @return ($a, $b, $c);
}

A create-list(1, 2, 3)

B create-list(1, 2)

C create-list(1)

D create-list()

💡 Hint

The function returns a list of the three parameters passed.

Only calling the function with three arguments returns a list with three items. Other calls have fewer arguments and will cause errors or return fewer items.

❓ accessibility

expert

How can you use Sass functions with @return to improve accessible color contrast?

You want to create a Sass function that returns a text color based on background brightness to ensure good contrast for accessibility. Which function correctly uses @return to achieve this?

A

@function accessible-text-color($bg) {
  @if lightness($bg) > 50% {
    @return #000000;
  } @else {
    @return #ffffff;
  }
}

B

@function accessible-text-color($bg) {
  @if lightness($bg) > 50% {
    #000000;
  } @else {
    @return #ffffff;
  }
}

C

@function accessible-text-color($bg) {
  @if lightness($bg) < 50% {
    @return #000000;
  } @else {
    #ffffff;
  }
}

D

@function accessible-text-color($bg) {
  @return if(lightness($bg) > 50%, #000000, #ffffff);
}

💡 Hint

Make sure every path in the function uses @return to send back a color.

Option A correctly uses @return in both branches to return black or white depending on background brightness, ensuring accessible contrast. Other options miss @return in some branches or have syntax errors.

Practice

1. What does the @return statement do in Sass?

easy

A. It sends a value back from a Sass function.

B. It creates a new CSS rule.

C. It imports another Sass file.

D. It defines a variable.

Solution

1. Step 1: Understand the purpose of @return

   The @return statement is used inside a Sass function to send a value back to where the function was called.

2. Step 2: Differentiate from other Sass features

   Other options describe different Sass features: creating CSS rules, importing files, or defining variables, which are not the role of @return.

3. Final Answer:

   It sends a value back from a Sass function. -> Option A

4. Quick Check:

   @return sends value back [OK]

Hint: Remember: @return always sends a value back [OK]

Common Mistakes:

• Thinking @return creates CSS rules
• Confusing @return with variable declaration
• Using @return outside a function

2. Which of the following is the correct syntax to return a value from a Sass function named double that doubles a number $n?

easy

A. @function double($n) { @output $n * 2; }

B. @function double($n) { return $n * 2; }

C. @function double($n) { $n * 2; }

D. @function double($n) { @return $n * 2; }

Solution

1. Step 1: Identify correct Sass function syntax

   In Sass, functions start with @function and use @return to send back a value.

2. Step 2: Check each option for correct usage

   @function double($n) { @return $n * 2; } uses @return correctly. @function double($n) { return $n * 2; } misses the @ before return. @function double($n) { $n * 2; } lacks any return statement. @function double($n) { @output $n * 2; } uses an invalid @output keyword.

3. Final Answer:

   @function double($n) { @return $n * 2; } -> Option D

4. Quick Check:

   Use @return inside @function [OK]

Hint: Always use @return with @function [OK]

Common Mistakes:

• Omitting the '@' before return
• Forgetting to include a return statement
• Using invalid keywords like '@output'

3. What will be the output CSS of the following Sass code?

@function triple($x) {
  @return $x * 3;
}

.box {
  width: triple(10px);
}

medium

A. .box { width: 30px; }

B. .box { width: triple(10px); }

C. .box { width: 10px; }

D. Syntax error

Solution

1. Step 1: Understand the function behavior

   The function triple multiplies the input by 3 and returns the result.

2. Step 2: Calculate the returned value

   Calling triple(10px) returns 10px * 3 = 30px. This value is assigned to the width property.

3. Final Answer:

   .box { width: 30px; } -> Option A

4. Quick Check:

   Function returns 3 times input [OK]

Hint: Multiply input inside function, output is computed value [OK]

Common Mistakes:

• Expecting the function name to appear in CSS
• Ignoring units like px in calculations
• Assuming no multiplication happens

4. Identify the error in this Sass function:

@function add($a, $b) {
  $sum: $a + $b;
}

medium

A. Cannot use addition inside functions.

B. Incorrect variable declaration syntax.

C. Missing @return statement to send back the result.

D. Function name should start with a dollar sign.

Solution

1. Step 1: Check function body for return statement

   The function calculates $sum but never returns it. Sass functions must use @return to send a value back.

2. Step 2: Verify other syntax elements

   Variable declaration and addition are correct. Function names do not start with a dollar sign. Addition is allowed inside functions.

3. Final Answer:

   Missing @return statement to send back the result. -> Option C

4. Quick Check:

   Functions need @return [OK]

Hint: Always end functions with @return [OK]

Common Mistakes:

• Forgetting to return the calculated value
• Thinking function names need $ prefix
• Assuming calculations auto-return

5. You want to create a Sass function adjust-color-brightness that takes a color and a percentage, then returns the color lightened or darkened by that percentage. Which of these is the best way to use @return inside this function?

hard

A. @function adjust-color-brightness($color, $percent) {
return if($percent > 0, lighten($color, $percent), darken($color, abs($percent)));
}

B. @function adjust-color-brightness($color, $percent) {
@if $percent > 0 {
@return lighten($color, $percent);
} @else {
@return darken($color, abs($percent));
}
}

C. @function adjust-color-brightness($color, $percent) {
lighten($color, $percent);
darken($color, abs($percent));
}

D. @function adjust-color-brightness($color, $percent) {
@return lighten($color, $percent);
@return darken($color, abs($percent));
}

Solution

1. Step 1: Understand conditional return usage

   The function should return either a lightened or darkened color based on the sign of $percent. Using @if with separate @return statements is clear and correct.

2. Step 2: Evaluate other options

   @function adjust-color-brightness($color, $percent) { return if($percent > 0, lighten($color, $percent), darken($color, abs($percent))); } uses return without @, which is invalid Sass syntax. @function adjust-color-brightness($color, $percent) { lighten($color, $percent); darken($color, abs($percent)); } lacks any @return, so no value is returned. @function adjust-color-brightness($color, $percent) { @return lighten($color, $percent); @return darken($color, abs($percent)); } has two @return statements in sequence, which is invalid because only one @return can be executed.

3. Final Answer:

   @function adjust-color-brightness($color, $percent) { @if $percent > 0 { @return lighten($color, $percent); } @else { @return darken($color, abs($percent)); } } -> Option B

4. Quick Check:

   Use conditional @return for multiple outcomes [OK]

Hint: Use one @return per condition inside functions [OK]

Common Mistakes:

• Placing multiple @return statements without conditions
• Not returning any value
• Using function calls without returning them