power function in sass

power_function.sass

@function pow($number, $exponent)
  @if (round($exponent) != $exponent)
    @return exp($exponent * ln($number))
    
  $value: 1
  
  @if $exponent > 0 
  
    @for $i from 1 through $exponent
      $value: $value * $number
  @else if $exponent < 0
    @for $i from 1 through -$exponent
      $value: $value / $number
    
  

  @return $value