Functions with parameters in SASS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function named double that takes one parameter n.

SASS

@function double($n) {
  @return $n [1] 2;
}

Drag options to blanks, or click blank then click option'

A+

B*

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of * will add 2 instead of doubling.

Using / will divide instead of multiply.

The function multiplies the parameter $n by 2 using the * operator.

2fill in blank

medium

Complete the code to call the function double with argument 5.

SASS

$result: double([1]);

Drag options to blanks, or click blank then click option'

An

Bdouble

C5

D$n

Attempts:

3 left

💡 Hint

Common Mistakes

Using the parameter name n instead of a value.

Using the function name double as argument.

To call the function with the number 5, pass 5 as the argument.

3fill in blank

hard

Fix the error in the function by completing the missing operator to subtract 1 from $x.

SASS

@function decrease($x) {
  @return $x [1] 1;
}

Drag options to blanks, or click blank then click option'

A-

B+

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using + will add 1 instead of subtracting.

Using * or / will multiply or divide instead of subtracting.

The function should subtract 1 from $x, so the operator is -.

4fill in blank

hard

Fill the blank to create a function scale that multiplies $value by $factor.

SASS

@function scale($value, $factor) {
  @return $value [1] $factor;
}

Drag options to blanks, or click blank then click option'

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using + or - will add or subtract instead of multiplying.

Using / will divide instead of multiply.

The function multiplies $value by $factor using the * operator.

5fill in blank

hard

Fill both blanks to create a function adjust that adds $offset to $base and then divides by $divider.

SASS

@function adjust($base, $offset, $divider) {
  @return ($base [1] $offset) [2] $divider;
}

Drag options to blanks, or click blank then click option'

A+

B-

C/

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using - instead of + for addition.

Using * instead of / for division.

The function adds $offset to $base using +, then divides the result by $divider using /.

Practice

1. What is the main purpose of using @function with parameters in Sass?

easy

A. To define CSS classes with fixed styles

B. To import external CSS files

C. To create reusable code blocks that accept different inputs

D. To add comments inside Sass files

Solution

1. Step 1: Understand what @function does

   @function defines reusable code that can take inputs and return values.

2. Step 2: Identify the role of parameters

   Parameters allow the function to work with different values each time it is called.

3. Final Answer:

   To create reusable code blocks that accept different inputs -> Option C

4. Quick Check:

   Functions with parameters = reusable code with inputs [OK]

Hint: Functions reuse code by accepting inputs [OK]

Common Mistakes:

• Confusing functions with mixins
• Thinking functions define CSS classes
• Assuming functions import files

2. Which of the following is the correct syntax to define a Sass function named double that takes one parameter $n?

easy

A. @function double { $n -> $n * 2; }

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

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

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

Solution

1. Step 1: Check the function keyword and parameter syntax

   The correct keyword is @function followed by the function name and parameters in parentheses.

2. Step 2: Verify the return statement

   The function must use @return to send back the result.

3. Final Answer:

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

4. Quick Check:

   Correct function syntax uses @function and @return [OK]

Hint: Use @function and @return with parameters in parentheses [OK]

Common Mistakes:

• Using 'function' without @
• Mixing up mixins and functions
• Omitting @return keyword

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

@function add($a, $b) { @return $a + $b; }
.box {
  width: add(10px, 5px);
}

medium

A. .box { width: 15px; }

B. .box { width: add(10px, 5px); }

C. .box { width: 10px + 5px; }

D. Syntax error due to missing semicolon

Solution

1. Step 1: Understand the function call

   The function add returns the sum of two values, here 10px + 5px = 15px.

2. Step 2: Check the output CSS

   The Sass compiler replaces the function call with the returned value, so width becomes 15px.

3. Final Answer:

   .box { width: 15px; } -> Option A

4. Quick Check:

   Function returns sum, output uses computed value [OK]

Hint: Functions return values replaced in CSS output [OK]

Common Mistakes:

• Expecting function name in output
• Thinking Sass outputs raw expressions
• Confusing mixin behavior with functions

4. Identify the error in this Sass function:

@function multiply($x, $y) {
  $result: $x * $y;
}

medium

A. Incorrect variable declaration syntax

B. Missing @return statement to output the result

C. Function name should be @mixin

D. Parameters must be declared without $

Solution

1. Step 1: Check function body for return

   The function assigns the product to a variable but does not return it.

2. Step 2: Understand function requirements

   Sass functions must use @return to send back a value; otherwise, they produce no output.

3. Final Answer:

   Missing @return statement to output the result -> Option B

4. Quick Check:

   Functions need @return to output values [OK]

Hint: Always use @return to output function results [OK]

Common Mistakes:

• Forgetting @return in functions
• Confusing mixins with functions
• Using variables without $

5. You want a Sass function responsive-size that takes a pixel value $px and returns a rem value assuming 16px base font size. Which function definition correctly achieves this?

hard

A. @function responsive-size($px) { @return $px / 16 * 1rem; }

B. @function responsive-size($px) { @return $px * 16rem; }

C. @function responsive-size($px) { @return $px + 16rem; }

D. @function responsive-size($px) { @return rem($px / 16); }

Solution

1. Step 1: Understand rem conversion

   To convert pixels to rem, divide the pixel value by the base font size (16).

2. Step 2: Write the correct return expression

   Multiply the division result by 1rem to get the rem unit value.

3. Step 3: Check each option

   @function responsive-size($px) { @return $px / 16 * 1rem; } correctly divides $px by 16 and multiplies by 1rem. Others either multiply incorrectly or use invalid functions.

4. Final Answer:

   @function responsive-size($px) { @return $px / 16 * 1rem; } -> Option A

5. Quick Check:

   Divide px by 16, multiply by 1rem for rem units [OK]

Hint: Divide px by 16 and multiply by 1rem for rem conversion [OK]

Common Mistakes:

• Multiplying px by 16 instead of dividing
• Adding units instead of multiplying
• Using undefined rem() function