Generated by SassMeister.com. http://sassmeister.com/gist/d75bb6c19aa60cc14965

SassMeister-input-HTML.html

SCSS functional-wrapper template

SassMeister-input.scss

// ----
// Sass (v3.4.9)
// Compass (v1.0.1)
// ----

//
  //
  // 1 Value is passed – attempt to set
  // 2 Format input
  // 3 Validate input
  // 4 Valid   => set global  
  // 5 Invalid => throw error
  // 6 Default value (or set outside function)
  // 7 Return value
  @function functional-wrapper($value: null){
    @if $value != null {                                 // 1  
      $value: to-lower-case(#{$value});                  // 2
      @if index(valid-value other-valid-value, $value) { // 3 
        $__value: $value !global;                        // 4 
      } @else {                                          // 5
        @error "Content direction can be either "
             + "`valid-value` or `other-valid-value` (case-insensitive). "
             + "Given: `#{$value}`. Aborting.";
      }
    }
    
    $__value: valid-value !default;                      // 6
    @return $__value;                                    // 7
  }


  .foo {
    default: functional-wrapper();
    set-value: functional-wrapper('other-valid-value');
    get-value: functional-wrapper();
    set-value: functional-wrapper('valid-value');
    // error: functional-wrapper(not-so-valid-value);
  }

SassMeister-output.css

.foo {
  default: valid-value;
  set-value: other-valid-value;
  get-value: other-valid-value;
  set-value: valid-value;
}

SassMeister-rendered.html

SCSS functional-wrapper template