Directive @for in SASS

The @for directive can be used to output specific styles in the amount specified by the counter variable. The first version of @for looks like this:

scss@for $var from (begin) through (end)

In this case, the range strictly includes the values ​​(start) and (end). It is worth paying attention to the fact that (start) and (end) - must return integers, since they set the counting direction, i.e. if (start) is less than (end), the counter will increase and, accordingly, if vice versa - decrease.

Let's consider the operation of the @for directive in the first syntax variant using the following example:

styles.scss@for $count from 1 through 5 {
  .li-#{$count} {
    width: $count + px;
  }
}

Compilation result:

styles.css.li-1 {
  width: 1px; 
}
.li-2 {
  width: 2px; 
}
.li-3 {
  width: 3px; 
}
.li-4 {
  width: 4px; 
}
.li-5 {
  width: 5px; 
}

In the second version, the entry looks like this:

scss@for $var from (start) to (end)

Here the value (end) is discarded.

Let's take the previous example and write it in the second version:

styles.scss@for $count from 1 to 5 {
  .li-#{$count} {
    width: $count + px;
  }
}

Now take a look at the resulting code:

styles.css.li-1 {
  width: 1px; 
}

.li-2 {
  width: 2px; 
}

.li-3 {
  width: 3px; 
}

.li-4 {
  width: 4px; 
}

styles.scss@for $var from 5 through 1 {
  li-#{$var} {
    padding: 10 * $var + px;
  }
}

styles.scss@for $var from 1 to 3 {
  .navbar-link-#{$var} {
    color: blue;
    width: 10px * $var;
  }
}