Flutter性能优化插件speed_up的使用

speed_up 是一个用于提升开发效率的Flutter插件，它提供了多种实用的扩展方法和工具类来简化代码编写。下面将详细介绍如何使用这个插件，并提供完整的示例demo。

安装

首先，在你的pubspec.yaml文件中添加speed_up依赖：

dependencies:
  speed_up: ^最新版本号

然后运行flutter pub get命令安装依赖。

基本用法

对象操作

import 'package:speed_up/speed_up.dart';

void main() {
  final someObj = {};
  print(someObj.isNull); // true
  print(someObj.isNotNull); // false
}

字符串扩展

检查字符串是否为空或null

void main() {
  String? str = "Some String";
  print(str.isNullOrEmpty); // false
  print(str.isNotNullOrEmpty); // true
}

首字母大写与标题格式化

void main() {
  final string = 'flutter is awesome';
  print(string.capitalized); // 'Flutter'
  print(string.titleCased); // 'Flutter Is Awesome'
}

集合操作

计算集合元素之和

void main() {
  final numbers = [1, 2, 3];
  final sum = numbers.sum();
  print('Sum: $sum'); // 输出：6
  
  final products = [Product(price: 100.99), Product(price: 49.99)];
  final totalPrice = products.sum((p) => p.price);
  print('Total Price: $totalPrice');
}

排序

void main() {
  final orders = [Order(amount: 50), Order(amount: 30)];
  final ordered = orders.orderBy((x) => x.amount, desc: true);
  print(ordered.map((order) => order.amount).toList()); // 输出：[50, 30]
}

分组

void main() {
  final people = [Person(name: 'John', age: 30), Person(name: 'Jane', age: 25)];
  final groups = people.groupBy((p) => p.age, map: (p) => p.name);
  print(groups); // 输出：{30: ['John'], 25: ['Jane']}
}

Debouncer（防抖）

在处理用户输入等场景时非常有用，可以避免频繁触发事件。

声明并使用Debouncer

import 'package:speed_up/speed_up.dart';

final debounce = Debounce(delay: const Duration(milliseconds: 100));

void onTextChange(String text) {
  debounce(() => print(text));
}

示例Demo

以下是一个完整的示例，演示了如何利用speed_up进行各种操作：

// ignore_for_file: avoid_print

import 'package:speed_up/speed_up.dart';

class CoinOrder {
  const CoinOrder(this.amount, this.coinPrice);

  final double amount;
  final double coinPrice;
}

class Person {
  const Person(
    this.name, {
    this.age,
  });

  final String name;
  final int? age;
}

void main() {
  // Summary of nums
  final arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  final arrSum = arr.sum();
  print('Array sum: $arrSum');

  // Take Random element
  for (var i = 0; i < 10; i++) {
    print('Random number: ${arr.random}');
  }

  // Take random X elements
  final randomElements = arr.takeRandom(7);
  print('Random elements (unique): $randomElements');

  // Take random X elements with possible duplicates
  final randomElementsWithDuplication = arr.takeRandom(7, mayHaveDuplicates: true);
  print('Random elements with duplication: $randomElementsWithDuplication');

  // Summary of Complex Object
  const orders = [CoinOrder(1.5, 2.5), CoinOrder(10.5, 3.5)];
  final amountSum = orders.sum((order) => order.amount);
  print('Amount sum: $amountSum');
}