Why variables reduce repetition in SASS - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a color variable in Sass.

SASS

$primary-color: [1];

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

Ablue

Bcolor

Cprimary

D#3498db

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name instead of a color value.

Forgetting the semicolon at the end.

In Sass, variables start with $. Here, $primary-color is set to a hex color code #3498db.

2fill in blank

medium

Complete the code to use the variable $primary-color for the background color.

SASS

button {
  background-color: [1];
}

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

A$primary-color

Bprimary-color

Ccolor-primary

D#primary-color

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the $ sign.

Adding extra characters like # before the variable.

To use a Sass variable, include the $ sign before the variable name.

3fill in blank

hard

Fix the error in the code to correctly use the variable for font color.

SASS

p {
  color: [1];
}

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

A$primary-color

B#primary-color

Cprimary-color

DprimaryColor

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names without $.

Using camelCase instead of kebab-case.

Variables in Sass must be referenced with the $ sign. Without it, Sass treats it as a plain string.

4fill in blank

hard

Fill both blanks to create a variable and use it for border color.

SASS

[1]: #e74c3c;
.box {
  border: 2px solid [2];
}

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

A$alert-color

B$border-color

D#alert-color

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for definition and usage.

Omitting the $ sign in either place.

First, define the variable $alert-color with the color value. Then use the same variable name to set the border color.

5fill in blank

hard

Fill all three blanks to define variables and use them for background and text colors.

SASS

[1]: #2ecc71;
[2]: #ffffff;
.card {
  background-color: [3];
  color: $text-color;
}

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

A$bg-color

B$text-color

D$background

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing variable names or misspelling them.

Forgetting the $ sign.

Define $bg-color and $text-color variables. Then use $bg-color for the background color and $text-color for the text color.

Practice

1. Why do Sass variables help reduce repetition in your stylesheets?

easy

A. Because you write a value once and reuse it many times

B. Because they automatically generate CSS classes

C. Because they make your code run faster in the browser

D. Because they replace HTML tags with CSS

Solution

1. Step 1: Understand what variables do in Sass

   Sass variables store a value like a color or size once.

2. Step 2: See how variables reduce repetition

   Using the variable multiple times means you write the value only once, so you avoid repeating it.

3. Final Answer:

   Because you write a value once and reuse it many times -> Option A

4. Quick Check:

   Variables store values to reuse = C [OK]

Hint: Variables store once, reuse many times [OK]

Common Mistakes:

• Thinking variables create CSS classes
• Believing variables speed up browser rendering
• Confusing variables with HTML tags

2. Which of the following is the correct way to declare a variable for a color in Sass?

easy

A. main-color = #3498db;

B. var main-color: #3498db;

C. $main-color: #3498db;

D. #main-color: $3498db;

Solution

1. Step 1: Recall Sass variable syntax

   Sass variables start with a dollar sign ($) followed by the name, then a colon and the value.

2. Step 2: Check each option

   The correct syntax is $main-color: #3498db; ($name: value;). A omits $ and uses =; C uses var; D uses #name: $value.

3. Final Answer:

   $main-color: #3498db; -> Option C

4. Quick Check:

   Sass variables start with $ = B [OK]

Hint: Variables start with $ and use colon : [OK]

Common Mistakes:

• Omitting the $ sign before variable name
• Using equal sign instead of colon
• Mixing variable and value order

3. What will be the background color of the button in this Sass code?

$btn-bg: #ff0000;
button {
  background-color: $btn-bg;
}

medium

A. Blue

B. Red

C. Green

D. No color (transparent)

Solution

1. Step 1: Identify the variable value

   The variable $btn-bg is set to #ff0000, which is the hex code for red.

2. Step 2: See how the variable is used

   The button's background-color is set to $btn-bg, so it will be red.

3. Final Answer:

   Red -> Option B

4. Quick Check:

   $btn-bg = #ff0000 (red) used as background = D [OK]

Hint: Hex #ff0000 means red color [OK]

Common Mistakes:

• Confusing hex codes with other colors
• Ignoring variable usage in property
• Assuming default button color

4. Identify the error in this Sass code that uses variables:

$font-size: 16px
p {
  font-size: $font-size;
}

medium

A. Missing semicolon after variable declaration

B. Variable name should not start with $

C. font-size property is invalid

D. Variable value should be in quotes

Solution

1. Step 1: Check variable declaration syntax

   In Sass, each statement must end with a semicolon. The variable $font-size: 16px is missing a semicolon.

2. Step 2: Verify other parts

   The variable name correctly starts with $, font-size is a valid property, and numeric values do not need quotes.

3. Final Answer:

   Missing semicolon after variable declaration -> Option A

4. Quick Check:

   Semicolon missing after variable = A [OK]

Hint: End variable lines with semicolon ; [OK]

Common Mistakes:

• Forgetting semicolon after variable value
• Removing $ from variable name
• Adding quotes around numeric values

5. You want to change the primary color used in many places in your Sass file. Which approach best uses variables to make this easy?

hard

A. Use inline styles in HTML instead of Sass variables

B. Write the color code directly in every CSS rule

C. Use different variable names for each place you use the color

D. Define a variable $primary-color once and use it everywhere for that color

Solution

1. Step 1: Understand the goal of variables

   Variables let you store a value once and reuse it many times, so changing it once updates all uses.

2. Step 2: Evaluate options

   Define a variable $primary-color once and use it everywhere for that color uses one variable for the primary color everywhere, making updates easy. The other approaches do not reduce repetition or make updates easy.

3. Final Answer:

   Define a variable $primary-color once and use it everywhere for that color -> Option D

4. Quick Check:

   One variable for reuse = A [OK]

Hint: Use one variable for repeated values [OK]

Common Mistakes:

• Repeating color codes everywhere
• Using many variables for the same value
• Mixing CSS inline styles with Sass variables