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I hope these multiple-choice questions can help you prepare for the front-end interview. The answers are at the end of the article.

1. In Sass, which of the following functions is used to create a placeholder selector?
   a) @placeholder
   b) @holder
   c) @extend
   d) @placeholder-selector

2. In Sassmap-get()What does the function do?
   a) Get the value of the specified key in the Map
   b) Merge two maps
   c) Determine whether the Map is empty
   d) Delete the key-value pair in the Map

3. In Sass, which of the following functions is used to set default values ​​for style properties?
   a) @default
   b) @set-default
   c) @if
   d) @each

4. Functions in Sassscale-color()What is it used for?
   a) Scale the brightness of the color
   b) Adjust the color saturation
   c) Convert color formats
   d) Interpolate the difference between two colors

5. In Sass, which of the following functions is used to create a style rule with a placeholder selector?
   a) @extend
   b) @placeholder
   c) @mixin
   d) @content

Answer:

1. a) @placeholder
2. a) Get the value of the specified key in the Map
3. a) @default
4. a) Scale the brightness of the color
5. b) @placeholder

explain:

1. In Sass, which of the following functions is used to create a placeholder selector?
   Answer: a) @placeholder

   Explanation: In Sass, the @placeholder function is used to create a placeholder selector. A placeholder selector is a special selector that will not be displayed directly in the generated CSS and will only take effect when inherited by other selectors. This can reduce duplicate style rules and improve the maintainability of the style sheet.

2. In Sassmap-get()What does the function do?
   Answer: a) Get the value of the specified key in the Map

   explain:map-get()Function is a function used in Sass to get the value corresponding to a specified key from a Map. Map is a collection data structure of key-value pairs.map-get()The function can get the corresponding value according to the given key. This function can help us operate and extract data in the Map more conveniently.

3. In Sass, which of the following functions is used to set default values ​​for style properties?
   Answer: a) @default

   Explanation: The @default function is used to set default values ​​for style properties in Sass. With the @default function, we can define a default value for a style property, which is automatically applied when the property is not specified in the style. This ensures that the property in the stylesheet always has a default value.

4. Functions in Sassscale-color()What is it used for?
   Answer: a) Scale the brightness of the color

   explain:scale-color()The function is a Sass function used to adjust the color brightness.scale-color()Function, we can scale the brightness of a color to make it brighter or darker. This function can be used to adjust the brightness of a color so that you can use colors of different brightness in your design.

5. In Sass, which of the following functions is used to create a style rule with a placeholder selector?
   Answer: b) @placeholder

   Explanation: In Sass, the @placeholder function is not only used to create the placeholder selector itself, but also to define the style rules of the placeholder selector. By adding style rules after @placeholder, we can specify styles for the placeholder selector, and these style rules will take effect when other selectors inherit the placeholder selector.