How do I reference a variable by its name in SASS? -

i working on sass framework has list of variables turn on , off features.

for example:

// atoms:     $use-pa: true;    $use-pt: true;    $use-pb: true;

i want able following in case variable turned off.

@mixin requires($collection: ()) {      @each $var in $collection {          #{$var}: true;      } }

and

@include requires((      $use-pa,      $use-pt,      $use-pb  ));

i looking way change variable's value name... if possible. #{} not work.

if want change variable's value, don't use interpolation. here's sassmeister play with.

CSS