_function.scss

@function brandcolor($name,$number:1) {
  $string-name: to-string($name);
  $string-name: str-replace($string-name," ","-");
  $string-name: str-replace($string-name,"_","-");
  $string-name: str-replace($string-name,"'","");

  $brand-key:   $string-name;
  $brand-name:  str-replace($brand-key,"-"," ");
  $brand-color: ();

  @if map-has-key($brandcolors, $brand-key) {
    $brand-color:        map-get($brandcolors, $brand-key);
    $brand-color-type:   type-of($brand-color);
    $brand-color-length: length($brand-color);

    @if $brand-color-length < $number {
      $color-text: if(($brand-color-length),"color","colors");
      @error "`#{$brand-name}` has only #{$brand-color-length} #{$color-text} and you're asking for number `#{$number}`";
    }
    @else if $brand-color-type == list {
      $brand-color: nth($brand-color, $number);
    }
  }
  @else {
    @error "The brand you are looking for does not exist or is misspelled: '#{$string-name}'";
  }

  $brand-color-type: type-of($brand-color);
  @if $brand-color-type != color {
    @error "The color number `#{$number}` of `#{$brand-name}` is not a valid color: `#{$brand-color}`";
  }

  @return $brand-color;
}