freeCodeCamp/curriculum/challenges/english/03-front-end-libraries/sass/use-if-and-else-to-add-logic-to-your-styles.english.md

id	title	required	challengeType
587d7dbe367417b2b2512bb8	Use @if and @else to Add Logic To Your Styles	src raw https://cdnjs.cloudflare.com/ajax/libs/sass.js/0.10.9/sass.sync.min.js true	0

Description

The @if directive in Sass is useful to test for a specific case - it works just like the if statement in JavaScript.

@mixin make-bold($bool) {
  @if $bool == true {
    font-weight: bold;
  }
}

And just like in JavaScript, @else if and @else test for more conditions:

@mixin text-effect($val) {
  @if $val == danger {
    color: red;
  }
  @else if $val == alert {
    color: yellow;
  }
  @else if $val == success {
    color: green;
  }
  @else {
    color: black;
  }
}

Instructions

Create a mixin called border-stroke that takes a parameter $val. The mixin should check for the following conditions using @if, @else if, and @else:

light - 1px solid black
medium - 3px solid black
heavy - 6px solid black
none - no border

Tests

tests:
  - text: Your code should declare a <code>mixin</code> named <code>border-stroke</code> which has a parameter named <code>$val</code>.
    testString: 'assert(code.match(/@mixin\s+?border-stroke\s*?\(\s*?\$val\s*?\)\s*?{/gi), "Your code should declare a <code>mixin</code> named <code>border-stroke</code> which has a parameter named <code>$val</code>.");'
  - text: 'Your <code>mixin</code> should have an <code>@if</code> statement to check if <code>$val</code> is light, and to set the <code>border</code> to 1px solid black.'
    testString: 'assert(code.match(/@if\s+?\$val\s*?===?\s*?light\s*?{\s*?border\s*?:\s*?1px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@if</code> statement to check if <code>$val</code> is light, and to set the <code>border</code> to 1px solid black.");'
  - text: 'Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is medium, and to set the <code>border</code> to 3px solid black.'
    testString: 'assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?medium\s*?{\s*?border\s*?:\s*?3px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is medium, and to set the <code>border</code> to 3px solid black.");'
  - text: 'Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is heavy, and to set the <code>border</code> to 6px solid black.'
    testString: 'assert(code.match(/@else\s+?if\s+?\$val\s*?===?\s*?heavy\s*?{\s*?border\s*?:\s*?6px\s+?solid\s+?black\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else if</code> statement to check if <code>$val</code> is heavy, and to set the <code>border</code> to 6px solid black.");'
  - text: Your <code>mixin</code> should have an <code>@else</code> statement to set the <code>border</code> to none.
    testString: 'assert(code.match(/@else\s*?{\s*?border\s*?:\s*?none\s*?;\s*?}/gi), "Your <code>mixin</code> should have an <code>@else</code> statement to set the <code>border</code> to none.");'

Challenge Seed

<style type='text/sass'>



  #box {
    width: 150px;
    height: 150px;
    background-color: red;
    @include border-stroke(medium);
  }
</style>

<div id="box"></div>

Solution

// solution required