Flutter Collection Equality

This repository demonstrates how to compare lists and maps using various equality libraries available in Dart for CLI projects and Flutter apps.

Table of Contents

• Introduction
• ListEquality
• UnorderedIterableEquality
• MapEquality
• deepCollectionEquality
• Getting Started

Introduction

When working with collections like lists and maps in Dart and Flutter, it's important to understand how equality is determined. Dart provides several equality libraries that offer different ways to compare collections for equality. This repository demonstrates the usage of these libraries.

ListEquality

The ListEquality class from the package:collection library allows you to compare lists in a flexible manner, either in ordered or unordered fashion.

import 'package:collection/collection.dart';

final listEquality = ListEquality();

final list1 = [1, 2, 3];
final list2 = [3, 2, 1];

print(listEquality.equals(list1, list2)); // Output: false

UnorderedIterableEquality

The UnorderedIterableEquality class is also part of the package:collection library and compares collections without considering their order.

import 'package:collection/collection.dart';

final unorderedEquality = UnorderedIterableEquality();

final list1 = [1, 2, 3];
final list2 = [3, 2, 1];

print(unorderedEquality.equals(list1, list2)); // Output: true

MapEquality

The MapEquality class allows you to compare maps for equality, considering keys and values.

import 'package:collection/collection.dart';

final mapEquality = MapEquality();

final map1 = {'a': 1, 'b': 2};
final map2 = {'b': 2, 'a': 1};

print(mapEquality.equals(map1, map2)); // Output: true

DeepCollectionEquality

When working with Flutter, you can use the DeepCollectionEquality function to compare nested collections like lists and maps.

import 'package:flutter/foundation.dart';
import 'package:collection/collection.dart';

final deepEquality = DeepCollectionEquality();

final list1 = [1, 2, {'a': 1, 'b': 2}];
final list2 = [{'b': 2, 'a': 1}, 2, 1];

print(deepEquality.equals(list1, list2)); // Output: true

Getting Started

To run the examples in this repository, follow these steps:

• Clone this repository: git clone https://github.com/itsmelaxman/flutter-collection-equality.git
• Navigate to the repository: cd flutter-collection-equality
• Run the main.dart