Flutter高效整数映射插件compact_int_map的使用

Flutter高效整数映射插件compact_int_map的使用

CompactIntMap 是一个轻量级实现的整数键映射，它通过两个并行列表（一个用于键，一个用于值）来高效存储键值对。它支持添加、更新、检索和删除映射的操作，还提供了一些实用方法来获取映射的大小、清空映射和克隆其内容。

特性

• 添加键值对：使用 put(key, value) 方法将与整数键关联的值存储起来。
• 检索值：使用 get(key) 方法检索值；如果键不存在，则返回 null。
• 更新值：重新使用 put(key, newValue) 更新现有键的值。
• 移除条目：使用 remove(key) 方法从映射中删除特定的键值对。
• 检查大小：使用 size() 方法获取当前映射中的条目数量。
• 清空映射：使用 clear() 方法从映射中移除所有条目。

开始使用

要在您的 Dart 项目中使用 compact_int_map，请将其添加到您的 pubspec.yaml 文件中：

dependencies:
  compact_int_map: ^latest_version

然后在您的 Dart 文件中导入该包，并创建一个 CompactIntMap 实例进行操作：

import 'package:compact_int_map/compact_int_map.dart';

void main() {
  final map = CompactIntMap();

  // 添加键值对
  map.put(1, 100);
  map.put(2, 200);
  map.put(3, 300);

  // 检索值
  print('Value for key 1: ${map.get(1)}'); // 输出: Value for key 1: 100
  print('Value for key 2: ${map.get(2)}'); // 输出: Value for key 2: 200
  print('Value for key 3: ${map.get(3)}'); // 输出: Value for key 3: 300
  print(
    'Value for key 4 (not set): ${map.get(4)}',
  ); // 输出: Value for key 4 (not set): null

  // 更新一个已存在的值
  map.put(2, 250);
  print(
    'Updated value for key 2: ${map.get(2)}',
  ); // 输出: Updated value for key 2: 250

  // 移除一个键
  map.remove(3);
  print(
    'Value for key 3 after removal: ${map.get(3)}',
  ); // 输出: Value for key 3 after removal: null

  // 获取映射的大小
  print(
    'Current size of the map: ${map.size()}',
  ); // 输出: Current size of the map: 2

  // 清空映射
  map.clear();
  print(
    'Size of the map after clearing: ${map.size()}',
  ); // 输出: Size of the map after clearing: 0
}

贡献

欢迎贡献！请阅读贡献指南以了解如何为项目做出贡献并设置开发环境。

许可证

MIT License

Copyright (c) 2024 Oleksii Shtanko

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

示例代码

import 'package:compact_int_map/src/compact_int_map.dart';

void main() {
  final map = CompactIntMap();

  // 添加键值对
  map.put(1, 100);
  map.put(2, 200);
  map.put(3, 300);

  // 检索值
  // ignore: avoid_print
  print('Value for key 1: ${map.get(1)}'); // 输出: Value for key 1: 100
  // ignore: avoid_print
  print('Value for key 2: ${map.get(2)}'); // 输出: Value for key 2: 200
  // ignore: avoid_print
  print('Value for key 3: ${map.get(3)}'); // 输出: Value for key 3: 300
  // ignore: avoid_print
  print(
    'Value for key 4 (not set): ${map.get(4)}',
  ); // 输出: Value for key 4 (not set): null

  // 更新一个已存在的值
  map.put(2, 250);
  // ignore: avoid_print
  print(
    'Updated value for key 2: ${map.get(2)}',
  ); // 输出: Updated value for key 2: 250

  // 移除一个键
  map.remove(3);
  // ignore: avoid_print
  print(
    'Value for key 3 after removal: ${map.get(3)}',
  ); // 输出: Value for key 3 after removal: null

  // 获取映射的大小
  // ignore: avoid_print
  print(
    'Current size of the map: ${map.size()}',
  ); // 输出: Current size of the map: 2

  // 清空映射
  map.clear();
  // ignore: avoid_print
  print(
    'Size of the map after clearing: ${map.size()}',
  ); // 输出: Size of the map after clearing: 0
}