js list foreach

const numbers = [1, 2, 3, 4, 5];

numbers.forEach(function(currentValue, index, array) {
  console.log(`Index ${index}: ${currentValue}`);
});

// 或者使用箭头函数简化代码
numbers.forEach((value, idx) => console.log(`Index ${idx}: ${value}`));

// 使用some方法，当找到第一个偶数时停止遍历
const hasEven = numbers.some(value => {
  if (value % 2 === 0) {
    console.log('Found an even number:', value);
    return true; // 这将停止遍历
  }
  return false;
});

const asyncOperation = async (value) => {
  // 模拟异步操作
  return new Promise(resolve => setTimeout(() => resolve(value * 2), 1000));
};

const promises = numbers.map(async value => await asyncOperation(value));

Promise.all(promises).then(results => {
  console.log('All async operations completed:', results);
});