KTX
The KTX Library provides a comprehensive set of tools for managing collections – groups of a variable number of items (possibly zero) that share significance to the problem being solved and are operated upon commonly.
Getting Started
associateBy
is an operation allows associate the list items with the given key.
final List<User> users = [
User(id: 1, firstName: "Dmytro", lastName: "Glynskyi"),
User(id: 2, firstName: "Vladimir", lastName: "Zelenskyi")
];
final Map<int, User> mappedUsers = users
.associateBy((user) => user.id);
mapToList
returns a list containing the results of applying the given transform
function.
final Map<int, User> users = {
1: User(firstName: "Dmytro", lastName: "Glynskyi"),
2: User(firstName: "Vladimir", lastName: "Zelenskyi")
};
final List<String> userName = users
.mapToList((key, user) => user.firstName);
sortBy
sorts elements in the list in-place according to natural sort order of the value returned by specified selector
function.
final List<User> users = [
User(id: 1, firstName: "Vladimir", lastName: "Glynskyi"),
User(id: 2, firstName: "Vladimir", lastName: "Zelenskyi")
];
final List<User> sortedByNameUsers = users
.sortBy((user) => user.firstName);
groupBy
groups elements of the original collection by the key returned by the given keySelector
function applied to each element
and returns a map where each group key is associated with a list of corresponding elements.
final List<User> users = [
User(id: 1, firstName: "Vladimir", lastName: "Glynskyi"),
User(id: 2, firstName: "Vladimir", lastName: "Zelenskyi")
];
final Map<String, List<User>> groupedUsers = users
.groupBy((user) => user.firstName);