Complex data structures

fonts.scss

$_helvetica: (
    'font-family': #{"Helvetica", sans-serif},
    'font-weight': (
        'default': 300,
        'light': 100,
        'normal': 300,
        'semi-bold': 500,
        'bold': 700
    ),
    'line-height': 1.3,
    'letter-spacing': '1px',
    'color': $fontColor,
);

@function _get($map, $key, $subKey: false){
    //check to see if the passed map exists
    @if(!global-variable-exists($map)){
        @warn "#{$map} doesn't exist.";
        @return false;
    }

    //check to see if the property key passed resolves to a value
    @if(map-has-key($map, $key)){

        @if($subKey and map-has-key($map, $subKey)){
            $key: map-get($map, $key);
            @return map-get($key, $subKey);
        }
        @else{
            @return map-get($map, $key);
        }
    }
    @else{
        @warn "#{$key} doesn't exist in #{$map}. Current font property options for #{$map} are: #{map-keys($map)}.";
        @return false;
    }
}