Pattern: Missing use of collection literal
Issue: -
DO use collection literals when possible.
Example of incorrect code:
var points = new List();
var addresses = new Map();
var uniqueNames = new Set();
var ids = new LinkedHashSet();
var coordinates = new LinkedHashMap();Example of correct code:
var points = [];
var addresses = <String,String>{};
var uniqueNames = <String>{};
var ids = <int>{};
var coordinates = <int,int>{};EXCEPTIONS:
There are cases with LinkedHashSet or LinkedHashMap where a literal constructor
will trigger a type error so those will be excluded from the lint.
void main() {
LinkedHashSet<int> linkedHashSet = LinkedHashSet.from([1, 2, 3]); // OK
LinkedHashMap linkedHashMap = LinkedHashMap(); // OK
printSet(LinkedHashSet<int>()); // LINT
printHashSet(LinkedHashSet<int>()); // OK
printMap(LinkedHashMap<int, int>()); // LINT
printHashMap(LinkedHashMap<int, int>()); // OK
}
void printSet(Set<int> ids) => print('$ids!');
void printHashSet(LinkedHashSet<int> ids) => printSet(ids);
void printMap(Map map) => print('$map!');
void printHashMap(LinkedHashMap map) => printMap(map);