Adjust-hue for color rotation in SASS - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

What does the adjust-hue function do in Sass?

Choose the best description of what adjust-hue does to a color in Sass.

A It rotates the color's hue angle by a specified number of degrees on the color wheel.

B It changes the brightness of the color by a given percentage.

C It changes the saturation of the color by a given percentage.

D It converts the color to grayscale.

💡 Hint

Think about how colors are represented on a wheel and what rotating the hue means.

The adjust-hue function rotates the hue of a color by the specified degrees, moving it around the color wheel. It does not affect brightness or saturation.

📝 Syntax

intermediate

What is the output color of this Sass code?

Given the Sass code below, what is the resulting color in hex format?

$base-color: #ff0000;
$result: adjust-hue($base-color, 120deg);

SASS

$base-color: #ff0000;
$result: adjust-hue($base-color, 120deg);

A #0000ff

B #ffff00

C #ff00ff

D #00ff00

💡 Hint

Red rotated by 120 degrees on the color wheel becomes which primary color?

Rotating red (#ff0000) by 120 degrees on the hue wheel results in green (#00ff00).

❓ rendering

advanced

Which Sass code snippet produces a blue color by rotating red's hue?

You want to create a blue color by rotating the hue of red (#ff0000). Which code snippet correctly does this?

A $color: adjust-hue(#ff0000, 60deg);

B $color: adjust-hue(#ff0000, 120deg);

C $color: adjust-hue(#ff0000, 240deg);

D $color: adjust-hue(#ff0000, -120deg);

💡 Hint

Blue is 240 degrees away from red on the hue wheel.

Rotating red (#ff0000) by 240 degrees on the hue wheel results in blue (#0000ff).

❓ selector

advanced

Which CSS selector targets elements with a background color adjusted by adjust-hue in Sass?

Given this Sass code, which CSS selector will match the elements styled with the adjusted hue background?

.btn {
  background-color: adjust-hue(#ff0000, 180deg);
}

A .btn:hover

B .btn

C #btn

D button.btn

💡 Hint

Look at the class name used in the Sass code.

The Sass code styles elements with the class btn. So the selector .btn matches those elements.

❓ accessibility

expert

How does using adjust-hue affect color contrast for accessibility?

If you use adjust-hue to rotate a color's hue, what should you check to maintain good accessibility?

A Ensure the rotated color still has sufficient contrast ratio against the background for readability.

B Only check the hue angle; contrast is not affected by hue changes.

C Adjust-hue automatically improves contrast, so no checks are needed.

D Use adjust-hue only on text colors, not backgrounds.

💡 Hint

Think about how color contrast affects people with vision impairments.

Rotating hue changes the color but may reduce contrast. Always verify contrast ratios to keep text readable and accessible.

Practice

1.

What does the adjust-hue function do in Sass?

easy

A. It adjusts the saturation of a color.

B. It changes the brightness of a color.

C. It rotates the hue of a color by a specified degree on the color wheel.

D. It converts a color to grayscale.

Solution

1. Step 1: Understand the purpose of adjust-hue

   The function changes the hue angle of a color, moving it around the color wheel.

2. Step 2: Compare with other color functions

   Brightness, grayscale, and saturation are different properties; adjust-hue specifically rotates hue.

3. Final Answer:

   It rotates the hue of a color by a specified degree on the color wheel. -> Option C

4. Quick Check:

   adjust-hue rotates hue = D [OK]

Hint: Remember: adjust-hue changes color angle, not brightness or saturation [OK]

Common Mistakes:

• Confusing hue rotation with brightness or saturation changes
• Thinking it converts colors to grayscale
• Assuming it changes color opacity

2.

Which of the following is the correct syntax to rotate the hue of #ff0000 by 90 degrees using adjust-hue in Sass?

?

easy

A. adjust-hue(#ff0000, 90deg)

B. adjust-hue(#ff0000, 90)

C. adjust-hue(#ff0000 90deg)

D. adjust-hue(#ff0000; 90deg)

Solution

1. Step 1: Check the function syntax

   adjust-hue takes two arguments separated by a comma: the color and the degree number (without unit).

2. Step 2: Identify correct argument format

   Degrees are passed as a number, not with deg unit in Sass.

3. Final Answer:

   adjust-hue(#ff0000, 90) -> Option B

4. Quick Check:

   Use number degrees without unit in adjust-hue = B [OK]

Hint: Use number only for degrees, no 'deg' unit in adjust-hue [OK]

Common Mistakes:

• Adding 'deg' unit to degree argument
• Missing comma between arguments
• Using semicolon instead of comma

3.

What color will be produced by this Sass code?

$color: #00ff00;
$new-color: adjust-hue($color, 120);

Choose the closest hex color output for $new-color.

medium

A. #ffff00

B. #ff0000

C. #00ffff

D. #0000ff

Solution

1. Step 1: Identify the original color hue

   #00ff00 is pure green, which is at 120° on the color wheel.

2. Step 2: Rotate hue by 120 degrees

   Adding 120° to green (120°) gives 240°, which is blue.

3. Step 3: Correct hue calculation

   Green is 120°, adding 120° gives 240°, which corresponds to blue (#0000ff).

4. Step 4: Re-examine options

   Since 120 + 120 = 240°, the color is blue (#0000ff), so #0000ff is correct.

5. Final Answer:

   #0000ff -> Option D

6. Quick Check:

   Green + 120° hue rotation = Blue = #0000ff [OK]

Hint: Add degrees to hue; green(120°) +120° = blue(240°) [OK]

Common Mistakes:

• Confusing hue degrees and resulting colors
• Not wrapping hue around 360 degrees
• Mixing RGB hex with hue values

4.

Identify the error in this Sass code snippet:

$base-color: #ff00ff;
$new-color: adjust-hue($base-color 60deg);

medium

A. Missing comma between arguments and incorrect degree unit.

B. Using an invalid color code.

C. adjust-hue cannot be used with variables.

D. The function requires three arguments.

Solution

1. Step 1: Check argument separation

   Arguments in adjust-hue must be separated by a comma; here, comma is missing.

2. Step 2: Check degree argument format

   Degrees should be passed as a number without deg unit in Sass.

3. Final Answer:

   Missing comma between arguments and incorrect degree unit. -> Option A

4. Quick Check:

   Comma and number-only degrees needed = C [OK]

Hint: Always separate args with comma and use number for degrees [OK]

Common Mistakes:

• Omitting comma between function arguments
• Adding 'deg' unit to degree argument
• Assuming adjust-hue needs three arguments

5.

You want to create a color palette by rotating the hue of #336699 by increments of 45 degrees four times. Which Sass code correctly generates the list of rotated colors?

?

hard

A. $base: #336699;
$palette: (
adjust-hue($base, 45),
adjust-hue($base, 90),
adjust-hue($base, 135),
adjust-hue($base, 180)
);

B. $base: #336699;
$palette: (
adjust-hue($base 45),
adjust-hue($base 90),
adjust-hue($base 135),
adjust-hue($base 180)
);

C. $base: #336699;
$palette: (
adjust-hue($base, 45deg),
adjust-hue($base, 90deg),
adjust-hue($base, 135deg),
adjust-hue($base, 180deg)
);

D. $base: #336699;
$palette: (
adjust-hue($base, 45),
adjust-hue($base, 90),
adjust-hue($base, 135),
adjust-hue($base, 225)
);

Solution

1. Step 1: Verify argument syntax for adjust-hue

   Degrees must be numbers without units and arguments separated by commas.

2. Step 2: Check the increments and values

   Rotations are 45, 90, 135, and 180 degrees, which are correct increments of 45.

3. Step 3: Compare options

   $base: #336699; $palette: ( adjust-hue($base, 45), adjust-hue($base, 90), adjust-hue($base, 135), adjust-hue($base, 180) ); uses correct syntax and increments. $base: #336699; $palette: ( adjust-hue($base 45), adjust-hue($base 90), adjust-hue($base 135), adjust-hue($base 180) ); misses commas. $base: #336699; $palette: ( adjust-hue($base, 45deg), adjust-hue($base, 90deg), adjust-hue($base, 135deg), adjust-hue($base, 180deg) ); uses invalid 'deg' units. $base: #336699; $palette: ( adjust-hue($base, 45), adjust-hue($base, 90), adjust-hue($base, 135), adjust-hue($base, 225) ); has wrong last increment (225 instead of 180).

4. Final Answer:

   code with correct syntax and increments -> Option A

5. Quick Check:

   Correct syntax + increments = A [OK]

Hint: Use commas and number degrees; check increments carefully [OK]

Common Mistakes:

• Using 'deg' units in degrees
• Missing commas between arguments
• Incorrect increment values in rotation