Accessing map values with map-get in SASS - Practice Problems & Coding Challenges

Challenge - 5 Problems

📝 Syntax

intermediate

What is the output of this Sass code using map-get?

Given the Sass map and the code below, what color will be assigned to background-color?

SASS

$colors: (primary: #ff0000, secondary: #00ff00, accent: #0000ff);

.my-class {
  background-color: map-get($colors, secondary);
}

A background-color: #00ff00;

B background-color: #ff0000;

C background-color: #0000ff;

D background-color: null;

💡 Hint

Remember that map-get retrieves the value for the given key in the map.

The map $colors has the key 'secondary' with value #00ff00, so map-get returns #00ff00.

🧠 Conceptual

intermediate

What happens if the key does not exist in the map?

Consider this Sass code snippet. What will be the value of color in the CSS output?

SASS

$theme-colors: (light: #eee, dark: #333);

.text {
  color: map-get($theme-colors, medium);
}

A color: null;

B color: #eee;

C color: #333;

D Syntax error during compilation

💡 Hint

If the key is missing, map-get returns null.

Since 'medium' is not a key in $theme-colors, map-get returns null, so color is null in CSS.

❓ selector

advanced

Which option correctly accesses a nested map value with map-get?

Given the nested map below, which option correctly gets the value #123456?

SASS

$palette: (
  theme1: (primary: #abcdef, secondary: #fedcba),
  theme2: (primary: #123456, secondary: #654321)
);

A map-get($palette, theme2, primary)

B map-get($palette, theme2.primary)

C map-get($palette, primary)

D map-get(map-get($palette, theme2), primary)

💡 Hint

Use map-get twice to access nested maps.

You first get the nested map for 'theme2', then get 'primary' from that nested map.

❓ layout

advanced

What CSS output results from this Sass map-get usage in a grid layout?

Given the Sass code below, what is the final CSS for the grid container's grid-template-columns?

SASS

$grid-settings: (columns: 3, gap: 1rem);

.container {
  display: grid;
  grid-template-columns: repeat(map-get($grid-settings, columns), 1fr);
  gap: map-get($grid-settings, gap);
}

A

display: grid;
grid-template-columns: repeat(3, 3fr);
gap: 1rem;

B

display: grid;
grid-template-columns: repeat(1fr, 3);
gap: 1rem;

C

display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 1rem;

D

display: grid;
grid-template-columns: repeat(3, 1fr);
gap: null;

💡 Hint

map-get returns the value for the key, which is used inside repeat() and gap.

map-get($grid-settings, columns) returns 3, and map-get($grid-settings, gap) returns 1rem, so the CSS is as in option C.

❓ accessibility

expert

How can map-get help improve accessibility in theming?

Consider a Sass map storing color themes for accessibility. Which approach correctly uses map-get to apply a high-contrast color for better readability?

SASS

$accessibility-colors: (normal: #333, high-contrast: #000000);

.text {
  color: map-get($accessibility-colors, high-contrast);
}

A It sets color to null, so the text color is inherited and may not be accessible.

B It applies a very dark color #000000 for high contrast, improving readability for users with vision impairments.

C It causes a compilation error because 'high-contrast' is not a valid key.

D It applies #333 which is too light and reduces contrast, making text harder to read.

💡 Hint

High contrast colors help users with vision difficulties read text better.

Using map-get to select the 'high-contrast' color #000000 ensures text is very dark and readable, improving accessibility.

Practice

1. What does the Sass function map-get($map, $key) do?

easy

A. It adds a new key-value pair to the map.

B. It deletes a key from the map.

C. It returns the value associated with the given key in the map.

D. It converts the map into a list.

Solution

1. Step 1: Understand the purpose of map-get

   The function map-get is designed to retrieve a value from a Sass map using a key.

2. Step 2: Identify the correct behavior

   It does not modify the map but simply returns the value for the specified key.

3. Final Answer:

   It returns the value associated with the given key in the map. -> Option C

4. Quick Check:

   map-get returns value by key [OK]

Hint: Remember: map-get fetches values, it doesn't change the map. [OK]

Common Mistakes:

• Thinking map-get adds or removes keys
• Confusing map-get with map-merge
• Expecting map-get to return the whole map

2. Which of the following is the correct syntax to get the value of key "primary-color" from a Sass map $colors?

easy

A. map-get($colors, "primary-color");

B. map-get($colors, primary_color);

C. map-get($colors, 'primary_color');

D. map-get($colors, primary-color);

Solution

1. Step 1: Check key format in Sass maps

   Keys that are strings must be quoted with double or single quotes in Sass.

2. Step 2: Identify correct syntax for string key

   Using double quotes around "primary-color" is correct; single quotes also work but only one option uses quotes properly.

3. Final Answer:

   map-get($colors, "primary-color"); -> Option A

4. Quick Check:

   String keys need quotes in map-get [OK]

Hint: Always quote string keys in map-get to avoid errors. [OK]

Common Mistakes:

• Not quoting string keys
• Using underscores instead of hyphens
• Confusing variable names with keys

3. Given the Sass map:

$settings: ("font-size": 16px, "color": #333, "margin": 1rem);

What will map-get($settings, "color") return?

medium

A. #333

B. 16px

C. 1rem

D. null

Solution

1. Step 1: Locate the key "color" in the map

   The map has a key "color" with value #333.

2. Step 2: Use map-get to retrieve the value

   Calling map-get with "color" returns #333 exactly.

3. Final Answer:

   #333 -> Option A

4. Quick Check:

   map-get returns #333 for "color" key [OK]

Hint: Match the key exactly to get the correct value. [OK]

Common Mistakes:

• Mixing up keys and values
• Expecting map-get to return the whole map
• Using wrong key names

4. What is the problem with this Sass code?

$theme: (primary: #0055ff, secondary: #ffaa00);
$color: map-get($theme, "primary");

medium

A. The key "primary" should not be quoted because keys are unquoted.

B. The map keys are unquoted but the key in map-get is quoted, causing null.

C. There is no problem; the code works correctly.

D. map-get requires the map variable to be quoted.

Solution

1. Step 1: Check key types in the map

   The map keys are unquoted identifiers: primary and secondary.

2. Step 2: Check key usage in map-get

   Using a quoted string "primary" does not match the unquoted key primary, so map-get returns null.

3. Final Answer:

   The map keys are unquoted but the key in map-get is quoted, causing null. -> Option B

4. Quick Check:

   Key types must match in map and map-get [OK]

Hint: Match quotes exactly between map keys and map-get keys. [OK]

Common Mistakes:

• Mixing quoted and unquoted keys
• Expecting map-get to find keys regardless of quotes
• Assuming map-get throws error on mismatch

5. You have a nested Sass map:

$themes: (
  light: ("background": #fff, "text": #000),
  dark: ("background": #000, "text": #fff)
);

How do you get the text color for the dark theme using map-get?

hard

A. map-get($themes, dark, text);

B. map-get($themes, "dark", "text");

C. map-get($themes[dark][text]);

D. map-get(map-get($themes, dark), "text");

Solution

1. Step 1: Understand nested map structure

   $themes is a map where each key (light, dark) maps to another map.

2. Step 2: Access nested map values step-by-step

   First, get the dark map with map-get($themes, dark), then get "text" from that map with map-get(..., "text").

3. Final Answer:

   map-get(map-get($themes, dark), "text"); -> Option D

4. Quick Check:

   Use nested map-get calls for nested maps [OK]

Hint: Use map-get inside map-get for nested maps. [OK]

Common Mistakes:

• Trying to pass multiple keys in one map-get
• Using incorrect syntax for nested access
• Assuming bracket notation works in Sass maps