scssmath.scss

// Strip units (from unit conversion)
@function number($val){
    @if($val==null){ @return null;} 
    @return $val/($val*0+1); 
}

// ======================
// Inbuild
// ======================
// floor
// ceil
// abs
// min
// max

// Returns the closest number within the range of min and max
// E.g.   clamp(-20, 10, 30) will return 10 
@function clamp($val, $min, $max) {
  $val:number($val); $min:number($min); $max:number($max);    
  @return if($val > $max, $max, 
          if($val < $min, $min, 
          $val));
}