isEmpty function
Implementation
bool isEmpty(obj) {
assert(obj is String || obj is List);
if (obj == null) return true;
if (obj is String && obj == '') return true;
if (obj is List && obj == []) return true;
return false;
}
bool isEmpty(obj) {
assert(obj is String || obj is List);
if (obj == null) return true;
if (obj is String && obj == '') return true;
if (obj is List && obj == []) return true;
return false;
}