已排序

sorted

Sort lists of complex objects with ease. Simple but powerful extension method.

auctions.sorted([
    SortedOrdered<Auction, AuctionStatus>(
        (action) => auction.buyerContext.status,
        [AuctionStatus.live, AuctionStatus.won, AuctionStatus.lost],
    ),
    SortedComparable<Auction, DateTime>((auction) => auction.endedAt),
    SortedComparable<Auction, DateTime>(
        (auction) => auction.endedAt,
        invert: true,
    )
]);

Usage

Add the package to your pubspec.yaml:

dependencies:
  sorted: <newest version>

Import the package:

import 'package:sorted/sorted.dart';

Call sorted extension method on any list and pass sorting rules of your choice. Order matters, so if first rule considers two items equal, next one will decide and so on.

Sorting rules

All rules have an optional named argument invert which inverts the sorting order.

SortedOrdered

SortedOrdered<Auction, AuctionStatus>(
  (auction) => auction.buyerContext.status,
  [AuctionStatus.live, AuctionStatus.won, AuctionStatus.lost],
)

Sorts items by the mapped property value in an order passed as a second argument. In this example, live auctions will be first, then won, and then lost.

SortedGroupOrdered

SortedOrdered<Road, RoadType>(
  (road) => road.type,
  [
    [RoadType.nationalHighway, RoadType.stateHighway],
    [RoadType.district],
    [RoadType.dirt],
  ],
)

Sorts items by the mapped property value in the order of order groups, but all values withing a certain group are considered equal.

SortedComparable

SortedComparable<User, String>((user) => user.lastName)

Sorts items by the mapped property value using Comparable.compare which is basically a.compareTo(b). Sorts strings alphabetically, numbers ascending, etc.

SortedComparator

SortedComparator<Auction, String>(
  (auction) => auction.buyerContext.status,
  (a, b) =>  /* your custom compare function */,
)

Sorts items by the mapped property value using a custom comparator provided as a second argument.