dart-core-extras #

Provides a set of utility types and extensions to Dart core packages Some examples are provided below.

Map Extensions #

valueOf #

Returns the value of the given key, if it exists.

final animalRatings = { "aardvark": 1, "baboon": 2 };
final aardvarkRating = animalRatings.valueOf("aardvark", newValue: 0); // Returns existing value of 1
final baboonRating = animalRatings.valueOf("baboon", newValue: 2); // Adds baboon and returns the value of 2

notContainsKey #

Whether this map does not contain the given key

final animalRatings = { "aardvark": 1, "baboon": 2 };
final notContainsAardvark = animalRatings.notContainsKey("aardvark"); // false
final notContainsCat = animalRatings.notContainsKey("cat"); // true

Rect Extensions #

inflateBySize #

Returns a new rectangle with all edges moved outwards by the given size

final rect = Offset.zero & Size.square(100);
final inflated = rect.inflateBySize(Size.square(50));
// inflated.left = -50
// inflated.right = 150
// inflated.top = -50
// inflated.bottom = 150

expandBySize #

Returns a new rectangle with only the right and bottom edges moved outwards by the given size

final rect = Offset.zero & Size.square(100);
final inflated = rect.inflateBySize(Size.square(50));
// inflated.left = 0
// inflated.right = 200
// inflated.top = 0
// inflated.bottom = 200