Code for implementing factorial (with precomputed inputs for removing the need to repeat previous computations

factorial.scss

@function factorial($endAt, $startAt: 1, $currentVal: 1) {
  $accVal: $currentVal;
    
  @for $i from $startAt + 1 to $endAt + 1 {
    $accVal: $i * $accVal;
  }
    
  @return $accVal;
}