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Rounding decimals in Sass
// _decimal.scss | MIT License | gist.github.com/terkel/4373420
// Round a number to specified digits.
//
// @param {Number} $number A number to round
// @param {Number} [$digits:0] Digits to output
// @param {String} [$mode:round] (round|ceil|floor) How to round a number
// @return {Number} A rounded number
// @example
// decimal-round(0.333) => 0
// decimal-round(0.333, 1) => 0.3
// decimal-round(0.333, 2) => 0.33
// decimal-round(0.666) => 1
// decimal-round(0.666, 1) => 0.7
// decimal-round(0.666, 2) => 0.67
//
@function decimal-round ($number, $digits: 0, $mode: round) {
$n: 1;
// $number must be a number
@if type-of($number) != number {
@warn '#{ $number } is not a number.';
@return $number;
}
// $digits must be a unitless number
@if type-of($digits) != number {
@warn '#{ $digits } is not a number.';
@return $number;
} @else if not unitless($digits) {
@warn '#{ $digits } has a unit.';
@return $number;
}
@for $i from 1 through $digits {
$n: $n * 10;
}
@if $mode == round {
@return round($number * $n) / $n;
} @else if $mode == ceil {
@return ceil($number * $n) / $n;
} @else if $mode == floor {
@return floor($number * $n) / $n;
} @else {
@warn '#{ $mode } is undefined keyword.';
@return $number;
}
}
// Ceil a number to specified digits.
//
// @param {Number} $number A number to round
// @param {Number} [$digits:0] Digits to output
// @return {Number} A ceiled number
// @example
// decimal-ceil(0.333) => 1
// decimal-ceil(0.333, 1) => 0.4
// decimal-ceil(0.333, 2) => 0.34
// decimal-ceil(0.666) => 1
// decimal-ceil(0.666, 1) => 0.7
// decimal-ceil(0.666, 2) => 0.67
//
@function decimal-ceil ($number, $digits: 0) {
@return decimal-round($number, $digits, ceil);
}
// Floor a number to specified digits.
//
// @param {Number} $number A number to round
// @param {Number} [$digits:0] Digits to output
// @return {Number} A floored number
// @example
// decimal-floor(0.333) => 0
// decimal-floor(0.333, 1) => 0.3
// decimal-floor(0.333, 2) => 0.33
// decimal-floor(0.666) => 0
// decimal-floor(0.666, 1) => 0.6
// decimal-floor(0.666, 2) => 0.66
//
@function decimal-floor ($number, $digits: 0) {
@return decimal-round($number, $digits, floor);
}
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