js for each循环

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

array.forEach(function(value, index, arr) {
  console.log(`Value at index ${index} is ${value}`);
});

// 普通函数
array.forEach(function(value) {
  console.log(value);
});

// 箭头函数
array.forEach(value => console.log(value));

// 使用 some 方法提前退出
array.some((value, index) => {
  if (value === 3) return true; // 这将中断循环
  console.log(value);
  return false;
});

async function processArray(array) {
  for (const value of array) {
    await someAsyncFunction(value);
  }
}

const obj = {
  value: 10,
  printValue: function() {
    array.forEach(value => {
      console.log(this.value + value); // this 正确指向 obj
    });
  }
};

obj.printValue();

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

numbers.forEach((number, index) => {
  console.log(`Index ${index}: ${number * 2}`);
});

Index 0: 2
Index 1: 4
Index 2: 6
Index 3: 8
Index 4: 10