SASS: How to check if a map exist [duplicate] - sass

Question

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Checking if a variable is defined in SASS
(3 answers)
Closed 8 years ago.
In SASS I would like to generate some css only if a map exists. For this I have to check first, if the map exists or not. It should work similar to this:
$mymap: (
width: 10px,
color: blue,
);
#if MAP-EXISTS($mymap) {
.myclass {
width: map-get($mymap, width);
color: map-get($mymap, blue);
}
}
Due to the fact that a function 'MAP-EXISTS()' does not exist in SASS:
I am looking for a way to do this on another way. But I cannot figure it out.
So my Question is: How can I check if a map exists in SASS?
(SASS Version is V3.4.9)
Thx for answers and help.

Answer 1

There isn't a way to check if a map exist, but you can check if map-has-key which returns true or false whether map has a value associated with a given key which may help you as an alternative solution.
An example:
$mymap: (
width: 10px,
color: blue,
);
.map-exist {
$map-existance: map-has-key($mymap, width);
$map-existance: map-has-key($mymap, color);
// Uncomment the line bellow to see that if a value doesn't exist
// it won't apply any propertie
// $map-existance: map-has-key($mymap, padding);
#if $map-existance == true {
width: map-get($mymap, width);
color: map-get($mymap, color);
}
}
A demo: http://sassmeister.com/gist/f7ecb5b1fb2781cc3225