Typography scale generation in SASS - Mini Project: Build & Apply

Typography Scale Generation with Sass

📖 Scenario: You are designing a website and want to create a consistent typography scale using Sass. This scale will help you apply harmonious font sizes across headings and paragraphs.

🎯 Goal: Build a Sass setup that generates a typography scale using a base font size and a scale ratio. You will create variables and a loop to produce font sizes for different heading levels.

📋 What You'll Learn

Create a base font size variable called $base-font-size with the value 1rem.

Create a scale ratio variable called $scale-ratio with the value 1.25.

Use a Sass @for loop with a variable $i from 1 to 6 to generate font sizes for headings h1 to h6.

Inside the loop, calculate the font size by multiplying $base-font-size by $scale-ratio raised to the power of (6 - $i).

Assign the calculated font size to each heading selector h#{$i}.

💡 Why This Matters

🌍 Real World

Typography scales help designers keep font sizes consistent and visually balanced across a website, improving readability and aesthetics.

💼 Career

Front-end developers and UI designers often use Sass to manage styles efficiently and create scalable design systems.

1

Set up base font size variable

Create a Sass variable called $base-font-size and set it to 1rem.

SASS

# Create a variable called $base-font-size and set it to 1rem
# Your code here

Hint

Use the syntax $variable-name: value; to create a Sass variable.

2

Add scale ratio variable

Create a Sass variable called $scale-ratio and set it to 1.25.

SASS

$base-font-size: 1rem;
# Create a variable called $scale-ratio and set it to 1.25
# Your code here

Hint

Remember to end the line with a semicolon.

3

Write a loop to generate heading font sizes

Write a Sass @for loop using the variable $i from 1 through 6.

SASS

$base-font-size: 1rem;
$scale-ratio: 1.25;

# Write a @for loop with $i from 1 through 6
# Your code here

Hint

Use @for $i from 1 through 6 { ... } to loop from 1 to 6.

4

Calculate and assign font sizes inside the loop

Inside the @for loop, calculate the font size by multiplying $base-font-size by $scale-ratio raised to the power of (6 - $i). Assign this font size to the heading selector h#{$i} using the font-size property.

SASS

$base-font-size: 1rem;
$scale-ratio: 1.25;

@for $i from 1 through 6 {
  // Calculate font size and assign to h#{$i}
  # Your code here
}

Hint

Use $scale-ratio ** (6 - $i) to raise the scale ratio to the power of (6 - $i).

Wrap the CSS selector and property inside the loop.

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