Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.1.0-beta)
// ----

/// Power function
/// @param {Number} $x
/// @param {Number} $n
/// @return {Number}
@function pow($x, $n) {
  $ret: 1;
    
  @if $n >= 0 {
    @for $i from 1 through $n {
      $ret: $ret * $x;
    } 
  } @else {
    @for $i from $n to 0 {
      $ret: $ret / $x;
    }
  }
  
  @return $ret;
}

/// toFixed() function in Sass
/// @param {Number} $float - number to format
/// @param {Number} $digits (2) - number of digits to leave
/// @return {Number}
@function to-fixed($float, $digits: 2) {  
  $sass-precision: 5;

  @if $digits > $sass-precision {
    @warn "Sass sets default precision to #{$sass-precision} digits, and there is no way to change that for now."
    + "The returned number will have #{$sass-precision} digits, even if you asked for `#{$digits}`."
    + "See https://github.com/sass/sass/issues/1122 for further informations.";
  }
  
  $pow: pow(10, $digits);
  @return round($float * $pow) / $pow;
}

/// Alias function to match JavaScript name
/// @alias to-fixed
@function toFixed($args...) {
  @return to-fixed($args);
}

/// Alias function to allow the use of precision()
/// @alias to-fixed
@function precision($args...) {
  @return to-fixed($args);
}

// Test case
sass {
  $number: 3.14159265359;
  to-fixed: to-fixed($number, 0);
  to-fixed: to-fixed($number, 1);
  to-fixed: to-fixed($number); // Default $digits is 2
  to-fixed: to-fixed($number, 3);
  to-fixed: to-fixed($number, 4);
  to-fixed: to-fixed($number, 5);
}

SassMeister-output.css

sass {
  to-fixed: 3.14;
  to-fixed: 3.1;
  to-fixed: 3.14;
  to-fixed: 3.142;
  to-fixed: 3.1416;
  to-fixed: 3.14159; }