函数闭包Dart颤动

void main() {
  var counter = 0;
  
  // 匿名闭包
  Function increment = () {
    counter++;
    print('Counter: $counter');
  };
  
  // 调用闭包
  increment(); // 输出: Counter: 1
  increment(); // 输出: Counter: 2
  
  // 命名闭包
  void closureExample() {
    var x = 10;
    print(x); // 输出: 10
  }
  
  closureExample();
}

import 'dart:collection';

void main() {
  var counter = 0;
  var weakCounter = WeakReference(counter);
  
  Function increment = () {
    counter++;
    print('Counter: ${weakCounter.value}');
  };
  
  increment(); // 输出: Counter: 1
  increment(); // 输出: Counter: 2
  
  // 手动释放
  counter = null;
  weakCounter.clear();
}