Generated by SassMeister.com.

EX1-input.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// ----

//Sass EX1

//Test
.testClass {
  color:yellow;
}

@mixin display (
  $disp, 
  $padding: null, 
  $r-margin: null,
  $l-margin: null) {
    display: $disp;
    padding: $padding;
    margin-left: $l-margin;
    margin-right: $r-margin;
}

.nav__item {
  @include display(inline-block, $l-margin: 20px);
}

.nav__link {
  @include display(block, 10px 5px);
}

EX1-output.css

.testClass {
  color: yellow;
}

.nav__item {
  display: inline-block;
  margin-left: 20px;
}

.nav__link {
  display: block;
  padding: 10px 5px;
}

SassMeister-input.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// ----

//Test EX1
.testClass {
  color:yellow;
}

@mixin display (
  $disp, 
  $padding: null, 
  $r-margin: null,
  $l-margin: null) {
    display: $disp;
    padding: $padding;
    margin-left: $l-margin;
    margin-right: $r-margin;
}

.nav__item {
  @include display(inline-block, $l-margin: 20px);
}

.nav__link {
  @include display(block, 10px 5px);
}

SassMeister-output.css

.testClass {
  color: yellow;
}

.nav__item {
  display: inline-block;
  margin-left: 20px;
}

.nav__link {
  display: block;
  padding: 10px 5px;
}