3.8 KiB
3.8 KiB
id | title | required | challengeType | |||||
---|---|---|---|---|---|---|---|---|
587d7dbf367417b2b2512bba | Use @each to Map Over Items in a List |
|
0 |
Description
@for
directive uses a starting and ending value to loop a certain number of times. Sass also offers the @each
directive which loops over each item in a list or map.
On each iteration, the variable gets assigned to the current value from the list or map.
@each $color in blue, red, green {A map has slightly different syntax. Here's an example:
.#{$color}-text {color: $color;}
}
$colors: (color1: blue, color2: red, color3: green);Note that the
@each $key, $color in $colors {
.#{$color}-text {color: $color;}
}
$key
variable is needed to reference the keys in the map. Otherwise, the compiled CSS would have color1
, color2
... in it.
Both of the above code examples are converted into the following CSS:
.blue-text {
color: blue;
}
.red-text {
color: red;
}
.green-text {
color: green;
}
Instructions
@each
directive that goes through a list: blue, black, red
and assigns each variable to a .color-bg
class, where the "color" part changes for each item.
Each class should set the background-color
the respective color.
Tests
tests:
- text: Your code should use the <code>@each</code> directive.
testString: assert(code.match(/@each /g), 'Your code should use the <code>@each</code> directive.');
- text: Your <code>.blue-bg</code> class should have a <code>background-color</code> of blue.
testString: assert($('.blue-bg').css('background-color') == 'rgb(0, 0, 255)', 'Your <code>.blue-bg</code> class should have a <code>background-color</code> of blue.');
- text: Your <code>.black-bg</code> class should have a <code>background-color</code> of black.
testString: assert($('.black-bg').css('background-color') == 'rgb(0, 0, 0)', 'Your <code>.black-bg</code> class should have a <code>background-color</code> of black.');
- text: Your <code>.red-bg</code> class should have a <code>background-color</code> of red.
testString: assert($('.red-bg').css('background-color') == 'rgb(255, 0, 0)', 'Your <code>.red-bg</code> class should have a <code>background-color</code> of red.');
Challenge Seed
<style type='text/sass'>
div {
height: 200px;
width: 200px;
}
</style>
<div class="blue-bg"></div>
<div class="black-bg"></div>
<div class="red-bg"></div>
Solution
The solution requires using the $color variable twice: once for the class name and once for setting the background color. You can use either the list or map data type.
List Data type
<style type='text/sass'>
@each $color in blue, black, red {
.#{$color}-bg {background-color: $color;}
}
div {
height: 200px;
width: 200px;
}
</style>
<div class="blue-bg"></div>
<div class="black-bg"></div>
<div class="red-bg"></div>
Map Data type
<style type='text/sass'>
$colors: (color1: blue, color2: black, color3: red);
@each $key, $color in $colors {
.#{$color}-bg {background-color: $color;}
}
div {
height: 200px;
width: 200px;
}
</style>
<div class="blue-bg"></div>
<div class="black-bg"></div>
<div class="red-bg"></div>