getAsNullableBoolean method
Converts map element into a boolean or returns null if conversion is not possible.
key
a key of element to get. Returns boolean value of the element or null if conversion is not supported.
See BooleanConverter.toNullableBoolean
Implementation
bool? getAsNullableBoolean(String key) {
var value = get(key);
return BooleanConverter.toNullableBoolean(value);
}