Breakpoint variables and maps in SASS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a breakpoint variable for mobile screens.

SASS

$mobile: [1];

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

A1024px

B480px

C768px

D1200px

Attempts:

3 left

💡 Hint

Common Mistakes

Using a desktop breakpoint value like 1024px for mobile.

Forgetting to add the unit 'px'.

The variable $mobile is set to 480px, which is a common width for mobile devices.

2fill in blank

medium

Complete the code to create a map of breakpoints with keys for mobile and tablet.

SASS

$breakpoints: (mobile: [1], tablet: 768px);

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

A320px

B1024px

C480px

D600px

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping mobile and tablet values.

Using a value without units.

The mobile key in the map is set to 480px, matching the mobile breakpoint.

3fill in blank

hard

Fix the error in the map definition by completing the missing value.

SASS

$breakpoints: (mobile: 480px, tablet: [1]);

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

A768px

B768

C1024

D1024px

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the 'px' unit causes errors.

Using a number without units in a map for breakpoints.

The value must include the unit px to be valid in Sass maps.

4fill in blank

hard

Fill both blanks to add a desktop breakpoint and use the map to get the tablet size.

SASS

$breakpoints: (mobile: 480px, tablet: 768px, desktop: [1]);
$tablet-size: map-get($breakpoints, [2]);

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

A1024px

Btablet

Cdesktop

D1280px

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong key name in map-get.

Forgetting units for the desktop breakpoint.

The desktop breakpoint is set to 1024px. The map-get function retrieves the value for the tablet key.

5fill in blank

hard

Fill all three blanks to define breakpoints and use them in a media query.

SASS

@media (min-width: [1]) {
  body {
    font-size: [2];
  }
}
$breakpoints: (mobile: 480px, tablet: 768px, desktop: [3]);

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

A768px

B1.2rem

C1024px

D1rem

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up breakpoint values and font sizes.

Forgetting units in media queries or font sizes.

The media query uses the tablet breakpoint 768px for minimum width. Inside, the font size is set to 1.2rem. The desktop breakpoint is defined as 1024px.

Practice

1. What is the main purpose of using breakpoint variables and maps in Sass?

easy

A. To manage responsive screen sizes clearly and easily

B. To create animations for buttons

C. To add colors to text

D. To write JavaScript inside Sass files

Solution

1. Step 1: Understand the role of breakpoints

   Breakpoints define screen sizes where styles change for responsiveness.

2. Step 2: Recognize how variables and maps help

   Using variables and maps organizes these breakpoints for easy updates and clarity.

3. Final Answer:

   To manage responsive screen sizes clearly and easily -> Option A

4. Quick Check:

   Breakpoint variables and maps = Manage screen sizes [OK]

Hint: Breakpoints control screen sizes; variables organize them [OK]

Common Mistakes:

• Thinking breakpoints add colors or animations
• Confusing Sass with JavaScript functionality
• Believing maps are for styling text

2. Which of the following is the correct way to define a breakpoint map in Sass?

easy

A. $breakpoints = {small: 480px, medium: 768px, large: 1024px};

B. $breakpoints: (small: 480px, medium: 768px, large: 1024px);

C. breakpoints: [small: 480px, medium: 768px, large: 1024px];

D. $breakpoints: [small => 480px, medium => 768px, large => 1024px];

Solution

1. Step 1: Recall Sass map syntax

   Sass maps use parentheses with key: value pairs separated by commas.

2. Step 2: Check each option

   $breakpoints: (small: 480px, medium: 768px, large: 1024px); uses correct syntax with $variable: (key: value, ...); others use invalid symbols or brackets.

3. Final Answer:

   $breakpoints: (small: 480px, medium: 768px, large: 1024px); -> Option B

4. Quick Check:

   Sass map syntax = parentheses and colons [OK]

Hint: Sass maps use parentheses and colons, not brackets or equals [OK]

Common Mistakes:

• Using = instead of : for variable assignment
• Using square brackets instead of parentheses
• Using => instead of : inside maps

3. Given the Sass code:

$breakpoints: (mobile: 480px, tablet: 768px, desktop: 1024px);

.container {
  @media (min-width: map-get($breakpoints, tablet)) {
    width: 80%;
  }
}

What will be the minimum screen width for the media query?

medium

A. 768px

B. 480px

C. 1024px

D. 640px

Solution

1. Step 1: Identify the map key used

   The media query uses map-get($breakpoints, tablet), so it looks for 'tablet' key.

2. Step 2: Find the value for 'tablet'

   In the map, 'tablet' corresponds to 768px.

3. Final Answer:

   768px -> Option A

4. Quick Check:

   map-get($breakpoints, tablet) = 768px [OK]

Hint: Look up the key in the map to find the breakpoint value [OK]

Common Mistakes:

• Confusing keys and values in the map
• Assuming default pixel values instead of map values
• Mixing up 'mobile' and 'tablet' keys

4. What is wrong with this Sass code snippet?

$breakpoints: (small: 480px, medium: 768px);

@media (min-width: map-get($breakpoints, large)) {
  .box { width: 100%; }
}

medium

A. The variable $breakpoints is not defined

B. The map-get function is used incorrectly

C. The media query syntax is invalid

D. The key 'large' does not exist in the $breakpoints map

Solution

1. Step 1: Check keys in the $breakpoints map

   The map only has 'small' and 'medium' keys, no 'large'.

2. Step 2: Understand map-get behavior

   Using map-get with a missing key returns null, causing invalid media query.

3. Final Answer:

   The key 'large' does not exist in the $breakpoints map -> Option D

4. Quick Check:

   Missing map key causes error [OK]

Hint: Verify map keys before using map-get [OK]

Common Mistakes:

• Assuming map-get works with any key
• Ignoring missing keys causing errors
• Thinking media query syntax is wrong

5. You want to add a new breakpoint 'xl' at 1280px to this Sass map:

$breakpoints: (sm: 480px, md: 768px, lg: 1024px);

Which is the correct way to update the map and use it in a media query for 'xl'?

hard

A. $breakpoints: append($breakpoints, (xl: 1280px));

@media (min-width: map-get($breakpoints, xl)) {
.content { padding: 2rem; }
}

B. $breakpoints: (xl: 1280px);

@media (min-width: map-get($breakpoints, xl)) {
.content { padding: 2rem; }
}

C. $breakpoints: map-merge($breakpoints, (xl: 1280px));

@media (min-width: map-get($breakpoints, xl)) {
.content { padding: 2rem; }
}

D. $breakpoints: (sm: 480px, md: 768px, lg: 1024px xl: 1280px);

@media (min-width: map-get($breakpoints, xl)) {
.content { padding: 2rem; }
}

Solution

1. Step 1: Understand how to add to existing map

   Use map-merge to add new key-value pairs without overwriting the whole map.

2. Step 2: Check each option

   append() is invalid for maps; reassigning only 'xl' overwrites and loses prior keys; missing comma between 'lg' and 'xl' causes syntax error; map-merge correctly adds 'xl' to the existing map.

3. Final Answer:

   $breakpoints: map-merge($breakpoints, (xl: 1280px)); @media (min-width: map-get($breakpoints, xl)) { .content { padding: 2rem; } } -> Option C

4. Quick Check:

   Use map-merge to add keys safely [OK]

Hint: Use map-merge to add keys without losing existing map [OK]

Common Mistakes:

• Overwriting the whole map instead of merging
• Using append which is invalid for maps
• Missing commas between key-value pairs in maps