Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.1.0-beta)
// ----

// A basic mixin example...
@mixin my-mixin ($selector: '.container', $has-something: true, $bg-color: #fff) {
  #{$selector} {
    @if ($has-something) {
      background: $bg-color;
    } @else {
      background: #c30c30;
    }
  }
}

// standard include
.selector {
  @include my-mixin();
}

// overriding $selector in my-mixin
.another-selector {
  @include my-mixin('.my-container');
}

// defining a map to pass into my-mixin
.yet-another-selector {
  $params : (
    'has-something': false,
    'selector': '.my-other-container'
  );
  @include my-mixin($params...);
}

SassMeister-output.css

.selector .container {
  background: #fff; }

.another-selector .my-container {
  background: #fff; }

.yet-another-selector .my-other-container {
  background: #c30c30; }