Typography scale generation in SASS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a base font size variable in Sass.

SASS

$base-font-size: [1];

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

A20px

B16px

C1.5rem

D12pt

Attempts:

3 left

💡 Hint

Common Mistakes

Using rem units instead of pixels for the base size.

Using an unusually large or small font size.

The base font size is commonly set in pixels for precise control. Here, 16px is a standard base size.

2fill in blank

medium

Complete the code to create a Sass function that calculates the font size by multiplying the base size by a scale factor.

SASS

@function font-scale($factor) {
  @return $base-font-size [1] $factor;
}

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Using division which would reduce the size.

The font size is calculated by multiplying the base font size by the scale factor, so the operator must be *.

3fill in blank

hard

Fix the error in the Sass map that defines the scale steps with their corresponding factors.

SASS

$scale-steps: (
  small: 0.875,
  base: 1,
  large: [1]
);

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

A'1.25'

B1,25

C1.25

Dlarge

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a number.

Using a comma instead of a dot for decimals.

The scale factor must be a number without quotes or commas. 1.25 is the correct decimal number.

4fill in blank

hard

Fill both blanks to create a Sass mixin that applies a font size from the scale map using the scale key.

SASS

@mixin apply-font-size($size) {
  font-size: font-scale($scale-steps[1]$size[2]);
}

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

A[

B]

C(

D)

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets.

Forgetting to close the bracket.

To access a value in a Sass map, use square brackets [] around the key.

5fill in blank

hard

Fill all three blanks to create a responsive typography scale using a CSS clamp function with min, preferred, and max font sizes.

SASS

font-size: clamp([1], [2], [3]);

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

A1rem

B2vw + 1rem

C2rem

Dcalc(1rem + 2vw)

Attempts:

3 left

💡 Hint

Common Mistakes

Using an expression without calc() for preferred size.

Swapping min and max values.

The clamp function needs a minimum size 1rem, a preferred size using calc(1rem + 2vw) for responsiveness, and a maximum size 2rem.

Practice

1. What is the main purpose of a typography scale in Sass?

easy

A. To create random font sizes for variety

B. To add animations to text elements

C. To change colors of text dynamically

D. To keep font sizes balanced and consistent across a website

Solution

1. Step 1: Understand typography scale concept

   A typography scale is used to keep font sizes balanced and consistent, avoiding random sizes.

2. Step 2: Identify the correct purpose

   Options A, C, and D describe unrelated tasks like randomness, colors, or animations, which are not the purpose of typography scales.

3. Final Answer:

   To keep font sizes balanced and consistent across a website -> Option D

4. Quick Check:

   Typography scale = balanced font sizes [OK]

Hint: Typography scales keep font sizes consistent and balanced [OK]

Common Mistakes:

• Thinking typography scales create random sizes
• Confusing typography scale with color or animation features
• Assuming typography scales are for layout spacing

2. Which of the following is the correct Sass function syntax to calculate a typography scale size with base size $base, ratio $ratio, and step $step?

easy

A. font-size: $base * $ratio ^ $step;

B. font-size: $base * math.pow($ratio, $step);

C. font-size: $base * ($ratio ** $step);

D. font-size: $base * pow($ratio, $step);

Solution

1. Step 1: Recall Sass math function syntax

   Sass uses the math module for functions like pow(), so the correct syntax is math.pow($ratio, $step).

2. Step 2: Check each option

   font-size: $base * pow($ratio, $step); uses pow() without math module, which is invalid. font-size: $base * $ratio ^ $step; uses ^ which is not Sass syntax. font-size: $base * ($ratio ** $step); uses ** which is not Sass syntax for exponentiation. font-size: $base * math.pow($ratio, $step); correctly uses math.pow($ratio, $step).

3. Final Answer:

   font-size: $base * math.pow($ratio, $step); -> Option B

4. Quick Check:

   Sass math.pow() = correct syntax [OK]

Hint: Use math.pow() with math module for exponent in Sass [OK]

Common Mistakes:

• Using ^ for exponent instead of math.pow()
• Forgetting to use math module prefix
• Trying pow() without math module

3. Given the Sass code:

$base: 1rem;
$ratio: 1.25;
$step: 3;
$size: $base * math.pow($ratio, $step);

What is the computed value of $size in rem units?

medium

A. 1.953125rem

B. 3.125rem

C. 2.4414rem

D. 4.0rem

Solution

1. Step 1: Calculate math.pow($ratio, $step)

   1.25 raised to the power 3 = 1.25 * 1.25 * 1.25 = 1.953125.

2. Step 2: Multiply by $base

   $base is 1rem, so 1rem * 1.953125 = 1.953125rem.

3. Step 3: Check options carefully

   1.953125rem shows 1.953125rem which matches calculation, but 2.4414rem shows 2.4414rem which is 1.25^4, not ^3.

4. Final Answer:

   1.953125rem -> Option A

5. Quick Check:

   1rem * 1.25^3 = 1.953125rem [OK]

Hint: Calculate ratio power step, then multiply by base size [OK]

Common Mistakes:

• Calculating power incorrectly (e.g., 1.25^4 instead of ^3)
• Multiplying base size by wrong power result
• Confusing rem units with pixels

4. Identify the error in this Sass function for typography scale:

@function scale($base, $ratio, $step) {
  @return $base * pow($ratio, $step);
}

medium

A. Missing math module prefix for pow function

B. Incorrect parameter names

C. Using @return instead of return

D. Function syntax is invalid in Sass

Solution

1. Step 1: Check Sass math function usage

   In Sass, pow() is inside the math module, so it must be called as math.pow().

2. Step 2: Verify other syntax

   Parameter names are fine, @return is correct Sass syntax, and function syntax is valid.

3. Final Answer:

   Missing math module prefix for pow function -> Option A

4. Quick Check:

   Use math.pow() not pow() alone [OK]

Hint: Always prefix pow() with math. in Sass functions [OK]

Common Mistakes:

• Calling pow() without math prefix
• Confusing @return with return keyword
• Thinking function syntax is wrong

5. You want to generate a typography scale in Sass that skips step 0 and starts from step 1, doubling the font size each step from a base of 1rem. Which Sass code correctly generates the size for step 3?

hard

A. $base: 1rem;
$ratio: 2;
$step: 3;
$size: $base * math.pow($ratio, $step + 1);

B. $base: 1rem;
$ratio: 2;
$step: 3;
$size: $base * math.pow($ratio, $step);

C. $base: 1rem;
$ratio: 2;
$step: 3;
$size: $base * math.pow($ratio, $step - 1);

D. $base: 1rem;
$ratio: 2;
$step: 3;
$size: $base * math.pow($ratio, 0);

Solution

1. Step 1: Understand skipping step 0

   Skipping step 0 means step 1 corresponds to power 0, so power = step - 1.

2. Step 2: Apply formula for step 3

   For step 3, power = 3 - 1 = 2, so size = 1rem * 2^2 = 4rem.

3. Step 3: Check options

   $base: 1rem; $ratio: 2; $step: 3; $size: $base * math.pow($ratio, $step - 1); uses $step - 1, correctly skipping step 0. $base: 1rem; $ratio: 2; $step: 3; $size: $base * math.pow($ratio, $step); uses $step directly, which would give 8rem for step 3. Options A and D are incorrect powers.

4. Final Answer:

   $base * math.pow($ratio, $step - 1); -> Option C

5. Quick Check:

   Skip step 0 by subtracting 1 from step [OK]

Hint: Subtract 1 from step to skip zero step in scale [OK]

Common Mistakes:

• Not adjusting step to skip zero
• Using step directly causing wrong size
• Confusing power calculation with addition