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@terkel
Last active June 17, 2024 14:07
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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);
}
@greycode-007
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this is so cool. thanks terkel

@sujaykumarh
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dart-sass deprecating use of / for division

fix:

// import at top of file
@use "sass:math";

Replacements

@return round($number * $n) / $n;

with

@return math.div(math.round($number * $n), $n);

@return ceil($number * $n) / $n;

with

@return math.div(math.ceil($number * $n), $n);

@return floor($number * $n) / $n;

with

@return math.div(math.floor($number * $n), $n);

@mtsweir
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mtsweir commented Jul 14, 2022

Is there a way to round decimal points in this example?

//
// Aspect ratio
//
// Example:
//
// 16:9 aspect ratio, use:
//
// .element {
// 	@include aspectRatio(16, 9);
// }
//
// 4:3 aspect ratio, use:
//
// .element {
// 	@include aspectRatio(4, 3);
// }
//

@use "sass:math";

@mixin aspectRatio($width, $height) {
	position: relative;

	&:before {
		display: block;
		content: "";
		padding-top: math.div($height, $width) * 100%;
		width: 100%;
	}

	> * {
		position: absolute;
		top: 0;
		bottom: 0;
		left: 0;
		width: 100%;
		height: 100%;
		border: 0;
	}
}

For a 16/9 aspect ratio, I am getting 56.25% - would be nice to round that down to 56% if possible.

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