Sass: @each

@each

The @each rule makes it easy to emit styles or evaluate code for each element of a list or each pair in a map.

It’s usually written @each <variable> in <expression> { ... }, where the expression returns a list.

The block is evaluated for each element of the list in turn, which is assigned to the given variable name.

The .scss file

$sizes: 40px, 50px, 80px;

@each $size in $sizes {
  .icon-#{$size} {
    font-size: $size;
    height: $size;
    width: $size;
  }
}

and the .css file

.icon-40px {
  font-size: 40px;
  height: 40px;
  width: 40px;
}

.icon-50px {
  font-size: 50px;
  height: 50px;
  width: 50px;
}

.icon-80px {
  font-size: 80px;
  height: 80px;
  width: 80px;
}

With Maps

You can also use @each to iterate over every key/value pair in a map by writing it @each <variable>, <variable> in <expression> { ... }. The key is assigned to the first variable name, and the element is assigned to the second.

Destructuring

If you have a list of lists, you can use @each to automatically assign variables to each of the values from the inner lists by writing it @each <variable...> in <expression> { ... }.

This is known as destructuring, since the variables match the structure of the inner lists.

Each variable name is sssigned to the value at the corresponding position in the list, or null if the list doesn't have enough values.

The .scss file

$icons:
  "eye" "\f112" 12px,
  "start" "\f12e" 16px,
  "stop" "\f12f" 10px;

@each $name, $glyph, $size in $icons {
  .icon-#{$name}:before {
    display: inline-block;
    font-family: "Icon Font";
    content: $glyph;
    font-size: $size;
  }
}

and the .css file

@charset "UTF-8";
.icon-eye:before {
  display: inline-block;
  font-family: "Icon Font";
  content: "";
  font-size: 12px;
}

.icon-start:before {
  display: inline-block;
  font-family: "Icon Font";
  content: "";
  font-size: 16px;
}

.icon-stop:before {
  display: inline-block;
  font-family: "Icon Font";
  content: "";
  font-size: 10px;
}