sass:meta module (type-of, inspect) - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is the output of type-of for a list?

Consider the Sass code:

$value: (1, 2, 3);
$result: type-of($value);

What is the value of $result?

SASS

$value: (1, 2, 3);
$result: type-of($value);

A "list"

B "map"

C "string"

D "number"

💡 Hint

Think about how Sass groups multiple values separated by commas.

The type-of function returns the type of the value passed. A value like (1, 2, 3) is a list in Sass, so the output is "list".

📝 Syntax

intermediate

What does inspect output for a color?

Given this Sass code:

$color: #ff0000;
$text: inspect($color);

What is the value of $text?

SASS

$color: #ff0000;
$text: inspect($color);

A "#f00"

B "red"

C "rgb(255, 0, 0)"

D "#ff0000"

💡 Hint

The inspect function returns a string representation of the value as Sass sees it.

The inspect function returns the exact string representation of the value. For the hex color #ff0000, it returns the full hex string "#ff0000".

❓ selector

advanced

Which type-of result matches a Sass map?

What does type-of return when called on a Sass map like (key: value)?

SASS

$map: (key: value);
$result: type-of($map);

A "list"

B "map"

C "string"

D "null"

💡 Hint

Maps are key-value pairs in Sass.

A Sass map is a collection of key-value pairs. The type-of function returns "map" for such values.

❓ rendering

advanced

What does inspect output for a nested list?

Given this Sass code:

$nested: (1, (2, 3));
$text: inspect($nested);

What is the value of $text?

SASS

$nested: (1, (2, 3));
$text: inspect($nested);

A "(1, 2, (3))"

B "1, 2, 3"

C "(1, (2, 3))"

D "(1, 2, 3)"

💡 Hint

The inspect function shows the exact structure including nested parentheses.

The inspect function returns a string that represents the value exactly as it is, including nested lists with parentheses.

❓ accessibility

expert

What error occurs when calling type-of on an undefined variable?

Consider this Sass code:

$result: type-of($undefined-variable);

What error will Sass raise?

SASS

$result: type-of($undefined-variable);

A Undefined variable error

B Type error

C Syntax error

D No error, returns "null"

💡 Hint

Using a variable that was never declared causes an error.

Sass raises an undefined variable error when you try to use a variable that has not been declared or assigned a value.

Practice

1. What does the Sass function type-of() do?

easy

A. It changes the type of a Sass value.

B. It prints the value to the console.

C. It converts Sass code to CSS.

D. It tells you the kind of value you have in Sass.

Solution

1. Step 1: Understand the purpose of type-of()

   This function returns the type of a given Sass value, like string, number, color, etc.

2. Step 2: Compare options with the function's behavior

   Only It tells you the kind of value you have in Sass. correctly describes that it tells the kind of value you have.

3. Final Answer:

   It tells you the kind of value you have in Sass. -> Option D

4. Quick Check:

   type-of() = tells value type [OK]

Hint: Remember: type-of() reveals the value's kind [OK]

Common Mistakes:

• Thinking type-of() changes the value type
• Confusing type-of() with output functions
• Assuming it converts Sass to CSS

2. Which of the following is the correct syntax to use inspect() on a Sass variable $color?

easy

A. inspect($color)

B. inspect $color;

C. inspect($color);

D. inspect $color()

Solution

1. Step 1: Recall correct function call syntax in Sass

   Functions require parentheses around arguments and no semicolon inside the parentheses.

2. Step 2: Check each option's syntax

   inspect($color) uses inspect($color) which is correct. inspect($color); has an extra semicolon inside parentheses, B misses parentheses, D has incorrect parentheses placement.

3. Final Answer:

   inspect($color) -> Option A

4. Quick Check:

   Function calls need parentheses [OK]

Hint: Use parentheses for Sass function calls [OK]

Common Mistakes:

• Omitting parentheses for function calls
• Adding semicolon inside function parentheses
• Misplacing parentheses after variable

3. Given the Sass code:

$value: 10px;
$result: type-of($value);

What is the value of $result?

medium

A. "string"

B. "number"

C. "length"

D. "px"

Solution

1. Step 1: Identify the type of $value

   The value 10px is a number with a unit in Sass, so its type is "number".

2. Step 2: Understand what type-of() returns

   It returns the type as a string, so $result will be "number".

3. Final Answer:

   "number" -> Option B

4. Quick Check:

   10px is a number type [OK]

Hint: Units don't change type; 10px is still a number [OK]

Common Mistakes:

• Thinking units create a new type like 'length'
• Confusing string with number
• Assuming type-of returns the unit

4. What is wrong with this Sass code?

$val: #ff0000;
$result: inspect $val;

medium

A. Missing parentheses for the inspect function call.

B. The variable $val is not defined.

C. inspect cannot be used with color values.

D. inspect requires a semicolon after the variable.

Solution

1. Step 1: Check function call syntax

   In Sass, functions must be called with parentheses around arguments.

2. Step 2: Identify the error in the code

   The code uses inspect $val; without parentheses, which is invalid syntax.

3. Final Answer:

   Missing parentheses for the inspect function call. -> Option A

4. Quick Check:

   Functions need parentheses [OK]

Hint: Always use parentheses when calling Sass functions [OK]

Common Mistakes:

• Calling functions without parentheses
• Assuming inspect can't handle colors
• Thinking semicolon is needed inside function call

5. You want to create a Sass mixin that prints the type and value of any input variable for debugging. Which code correctly uses type-of() and inspect() together?

hard

A. @mixin debug($var) { content: "Type: $var.type, Value: $var.inspect"; }

B. @mixin debug($var) { content: "Type: type-of($var), Value: inspect($var)"; }

C. @mixin debug($var) { content: "Type: #{type-of($var)}, Value: #{inspect($var)}"; }

D. @mixin debug($var) { content: "Type: #{inspect(type-of($var))}, Value: #{type-of(inspect($var))}"; }

Solution

1. Step 1: Understand string interpolation in Sass

   Use #{} to insert function results inside strings.

2. Step 2: Check each option's correctness

   @mixin debug($var) { content: "Type: #{type-of($var)}, Value: #{inspect($var)}"; } correctly calls type-of($var) and inspect($var) inside interpolation. @mixin debug($var) { content: "Type: type-of($var), Value: inspect($var)"; } treats functions as plain text. @mixin debug($var) { content: "Type: $var.type, Value: $var.inspect"; } uses invalid property access. @mixin debug($var) { content: "Type: #{inspect(type-of($var))}, Value: #{type-of(inspect($var))}"; } mixes function calls incorrectly.

3. Final Answer:

   @mixin debug($var) { content: "Type: #{type-of($var)}, Value: #{inspect($var)}"; } -> Option C

4. Quick Check:

   Use #{function()} for interpolation [OK]

Hint: Use #{ } to insert function results inside strings [OK]

Common Mistakes:

• Not using interpolation for function calls
• Trying to access functions as properties
• Nesting functions incorrectly