Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.4)
// Compass (v1.0.0.alpha.18)
// ----

@function combine($prefix, $list) {
  $temp: "";

  $n: length($list);
  
  @for $i from 1 through $n {
    @if $i == $n {
       $temp: $temp + $prefix + nth($list, $i) ;
    } @else {
       $temp: $temp + $prefix + nth($list, $i) + ",";
    }
  }
  @return $temp;
}

@mixin log($comment, $value: null) {
  @if $value == null {
    /* debug:  #{$comment}	*/
  } @else {
    /* debug: #{$comment}:#{$value}	*/
  }
}


//@include combine("fred", a, b, c...)
@include log(combine("prefix_", a b c))

SassMeister-output.css

/* debug:  prefix_a,prefix_b,prefix_c	*/