SASS (SCSS) strip-unit() function

strip-unit.scss

@function strip-unit($value, $newUnit: "") {
    //https://www.sitepoint.com/understanding-sass-units/
    $units: (
        'px':   0px,
        'cm':   0cm,
        'mm':   0mm,
        '%':    0%,
        'ch':   0ch,
        'in':   0in,
        'em':   0em,
        'rem':  0rem,
        'pt':   0pt,
        'pc':   0pc,
        'ex':   0ex,
        'vw':   0vw,
        'vh':   0vh,
        'vmin': 0vmin,
        'vmax': 0vmax,
        'deg':  0deg,
        'turn': 0turn,
        'rad':  0rad,
        'grad': 0grad,
        's':    0s,
        'ms':   0ms,
        'Hz':   0Hz,
        'kHz':  0kHz,
        'dppx': 0dppx,
        'dpcm': 0dpcm,
        'dpi':  0dpi,
    );

    //https://css-tricks.com/snippets/sass/strip-unit-function/
    $number: $value / ($value * 0 + 1);

    @if ($newUnit == "") {
        @return $number;
    }

    @if map-has-key($units, $newUnit) {
        @return map-get($units, $newUnit) + $number;
    }

    @error "Unknown unit `#{$newUnit}`.";
}


/* Test */

$value: 4Hz;
div {
    val: $value;
    transition-duration: 0kHz + $value/3;
    test1: strip-unit(1/$value, 's')/2;
    test2: strip-unit(1/$value)/2;
}