without method
Deletes keys and their values from this map and
returns a new map without them.
Example:
final style = {'color': 'red', 'font-size': '10px', 'font-weight': 'bold'};
final withoutColorAndSize = style.except(['color', 'font-size']);
// returns: {'font-weight': 'bold'}
Implementation
Map<String, String> without(List<String> keys) {
final map = Map<String, String>.of(this);
for (final key in keys) map.remove(key);
return map;
}