sass:list module - Practice Problems & Coding Challenges

Challenge - 5 Problems

📝 Syntax

intermediate

What is the output of this Sass code using list.nth?

Consider the following Sass code snippet:

$colors: red, green, blue, yellow;
$second-color: list.nth($colors, 2);
.result {
  color: $second-color;
}

What color will be applied to the .result class?

SASS

$colors: red, green, blue, yellow;
$second-color: list.nth($colors, 2);
.result {
  color: $second-color;
}

A yellow

B blue

C red

D green

💡 Hint

Remember that list.nth uses 1-based indexing in Sass lists.

The list $colors has items: red (1), green (2), blue (3), yellow (4). list.nth($colors, 2) returns the second item, which is green.

🧠 Conceptual

intermediate

How many items does this Sass list contain?

Given the Sass list:

$my-list: 10px 20px 30px 40px;

What is the result of list.length($my-list)?

SASS

$my-list: 10px 20px 30px 40px;
$length: list.length($my-list);
.result {
  width: $length * 1rem;
}

A 4

B 1

C 0

D 5

💡 Hint

Count the number of space-separated items in the list.

The list has four items: 10px, 20px, 30px, and 40px. So list.length returns 4.

❓ selector

advanced

Which option correctly appends an item to a Sass list?

You want to add the value purple to the end of the list $colors: red, green, blue; using the Sass list module.
Which option produces the correct new list?

SASS

$colors: red, green, blue;
$new-colors: /* your code here */;
.result {
  content: inspect($new-colors);
}

A list.append($colors, purple)

B list.push($colors, purple)

C list.insert($colors, purple)

D list.add($colors, purple)

💡 Hint

Check the official Sass list module function names for adding items.

The correct function to add an item to the end of a list is list.append(). list.push(), list.add(), and list.insert() do not exist or have different signatures.

❓ layout

advanced

What is the visual result of this Sass code using list.join?

Given these Sass variables:

$list1: 1rem 2rem 3rem;
$list2: 4rem 5rem;
$joined: list.join($list1, $list2, comma);
.box {
  margin: $joined;
}

What margin values will the .box class have in the compiled CSS?

SASS

$list1: 1rem 2rem 3rem;
$list2: 4rem 5rem;
$joined: list.join($list1, $list2, comma);
.box {
  margin: $joined;
}

A margin: 1rem 2rem 3rem 4rem 5rem;

B margin: 1rem 2rem 3rem, 4rem 5rem;

C margin: 1rem, 2rem, 3rem, 4rem, 5rem;

D margin: 1rem, 2rem, 3rem 4rem, 5rem;

💡 Hint

The third argument to list.join controls the separator between lists.

list.join with the separator 'comma' joins the two lists with commas between all items, so the margin property will have comma-separated values.

❓ accessibility

expert

Which Sass list operation helps improve accessibility by managing focus order?

You have a list of focusable elements in Sass representing tab order:

$focus-order: header, main, footer;

You want to insert a new element nav between header and main to improve keyboard navigation.
Which Sass list module function correctly inserts nav at position 2?

SASS

$focus-order: header, main, footer;
$new-focus-order: /* your code here */;

A list.prepend($focus-order, nav)

B list.insert($focus-order, nav, 2)

C list.append($focus-order, nav)

D list.nth($focus-order, 2)

💡 Hint

Think about how to add an item at a specific position in a list.

list.insert allows inserting an item at a specific index. Here, inserting 'nav' at position 2 places it between 'header' and 'main'. list.append adds at the end, list.prepend at the start, and list.nth only retrieves an item.

Practice

1.

What is the main purpose of the sass:list module in Sass?

easy

A. To provide functions for managing lists like adding or removing items

B. To create color palettes automatically

C. To handle font styles and sizes

D. To compile Sass files into CSS

Solution

1. Step 1: Understand the sass:list module role

   The sass:list module offers functions to work with lists, such as adding, removing, or finding items.

2. Step 2: Compare options with module purpose

   Options A, B, and D describe unrelated tasks like colors, fonts, or compilation, which are not the sass:list module's job.

3. Final Answer:

   To provide functions for managing lists like adding or removing items -> Option A

4. Quick Check:

   sass:list = list management [OK]

Hint: sass:list is all about list operations, not colors or fonts [OK]

Common Mistakes:

• Confusing sass:list with color or font modules
• Thinking sass:list compiles Sass files
• Assuming sass:list handles CSS properties directly

2.

Which of the following is the correct way to import the sass:list module in your Sass file?

easy

A. @forward "sass:list";

B. @import "sass:list";

C. @include "sass:list";

D. @use "sass:list";

Solution

1. Step 1: Recall Sass module import syntax

   Modern Sass uses @use to import modules, not @import which is deprecated.

2. Step 2: Match options with correct syntax

   @use "sass:list"; uses @use "sass:list"; which is the correct way to import the list module.

3. Final Answer:

   @use "sass:list"; -> Option D

4. Quick Check:

   Use @use for modules [OK]

Hint: Always use @use for Sass modules, not @import [OK]

Common Mistakes:

• Using @import instead of @use
• Confusing @include with module import
• Using @forward incorrectly for importing

3.

Given the Sass code below, what will be the output of list.length($colors)?

@use "sass:list";
$colors: red, green, blue;

.result {
  length: list.length($colors);
}

medium

A. length: 1;

B. length: 0;

C. length: 3;

D. length: 4;

Solution

1. Step 1: Understand the list variable

   The variable $colors contains three items: red, green, and blue.

2. Step 2: Apply list.length function

   The list.length() function returns the number of items in the list, which is 3 here.

3. Final Answer:

   length: 3; -> Option C

4. Quick Check:

   3 items in list = 3 [OK]

Hint: Count items separated by commas for list length [OK]

Common Mistakes:

• Counting commas instead of items
• Confusing list length with string length
• Forgetting to import sass:list module

4.

Identify the error in the following Sass code using sass:list module:

@use "sass:list";
$items: 1 2 3;
$new-items: list.push($items, 4);

.result {
  content: $new-items;
}

medium

A. Using list.push instead of list.append

B. Missing commas between list items in $items

C. Incorrect module import syntax

D. Cannot append numbers to lists

Solution

1. Step 1: Check list syntax in $items

   The list $items is written as 1 2 3 without commas, which is valid space-separated list.

2. Step 2: Understand list.append behavior

   The sass:list module has list.append() to add items, but no list.push().

3. Step 3: Identify the error

   The code uses non-existent list.push(), causing a compilation error. Change to list.append().

4. Final Answer:

   Using list.push instead of list.append -> Option A

5. Quick Check:

   sass:list.append exists, list.push does not [OK]

Hint: sass:list uses list.append, not list.push [OK]

Common Mistakes:

• Confusing list.append with list.push (no list.push in sass:list)
• Assuming space-separated lists are always safe
• Ignoring module import correctness

5.

You want to combine two lists $list1: 1, 2, 3; and $list2: 4, 5; into one list using sass:list functions. Which code snippet correctly joins these lists?

@use "sass:list";

// Options:
// A
$combined: list.length($list1) + list.length($list2);

// B
$combined: list.append($list1, $list2);

// C
$combined: list.insert($list1, $list2, 1);

// D
$combined: list.join($list1, $list2, comma);

hard

A. $combined: list.length($list1) + list.length($list2);

B. $combined: list.join($list1, $list2, comma);

C. $combined: list.insert($list1, $list2, 1);

D. $combined: list.append($list1, $list2);

Solution

1. Step 1: Understand list.join function

   The list.join() function combines two lists into one, with a separator (comma or space).

2. Step 2: Analyze each option

   $combined: list.join($list1, $list2, comma); correctly uses list.join($list1, $list2, comma) to join lists with commas.
   $combined: list.append($list1, $list2); appends the entire second list as one item, not merging.
   $combined: list.insert($list1, $list2, 1); inserts the whole second list at position 1, nesting it.
   $combined: list.length($list1) + list.length($list2); adds lengths, not lists.

3. Final Answer:

   $combined: list.join($list1, $list2, comma); -> Option B

4. Quick Check:

   Use list.join to merge lists [OK]

Hint: Use list.join to merge two lists cleanly [OK]

Common Mistakes:

• Using list.append to merge lists (adds as one item)
• Using list.insert to add whole list inside another
• Adding lengths instead of joining lists