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  <div id="mi-blk1">blk1</div>
  <div id="mi-blk2">blk2</div>
  <div id="mi-blk3">blk3</div>
  <div id="mi-blk4">blk4</div>
  <div id="mi-blk5">blk5</div>
  <div id="mi-blk6">blk6</div>
              @import "compass/css3";

// Mixins
// Los mixins son como las funciones pero estas no devuelven
// un valor de retorno y no es obligatorio definir parámetros.

// Mixin sin parámetros.

@mixin blk {
  background-color: blue;
  width: 40px;
  height: 40px;

#mi-blk1 {
  @include blk;

// Mixin con un parámetro

@mixin blk2 ($color) {
  background-color: $color;
  width: 40px;
  height: 40px;

#mi-blk2 {
  @include blk2(red);

// Mixin con 2 parámetros y uno con un valor por defecto

@mixin blk3 ($color, $ancho: 60px) {
  background-color: $color;
  width: $ancho;
  height: 40px;

#mi-blk3 {
  @include blk3(grey, 40px);

#mi-blk4 {
  @include blk3(green);

// Funciones
// Las funciones son parecidas a los mixins pero estas pueden
// devolver valores.

// Usar Funciones

#mi-blk5 {
  width: 40px;
  height: 40px;
  // La función darken() oscurese un color, en este caso el
  // amarillo.
  background-color: darken(yellow,30%);

// Crear una función

// calcular el numero aureo

@function golden-radio($numero) {
  // Devuelvo el número áureo
  @return floor($numero / 1.62);

#mi-blk6 {  
  width: golden-radio(80px); // = 49.3
  height: 40px;
  background-color: darkgreen;
 *  Ejemplo de Matías Muñoz para elementalcode.net

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