javascript - 修改数组所有元素的值

Question

我想更改数组列表中所有元素的值

    if (country.hostel) {
        country.hostel.forEach(function (hostel, index) {
            hostel.room.forEach(function (room, index) {
                room = {code:{value: BOOKED}};
            });
        });
    }

但是我在代码中有一个警告，好像房间值不会改变

The value assigned is never used 

Answer 1

你可以这样做:

(country.hostel || []).forEach(hostel => hostel.room.forEach((room) => {
  room.code.value = BOOKED
}));

const country = {
  hostel: [
    {
      room: [
        { code: { value: 'AAAAA' } },
        { code: { value: 'AAAAA' } },
        { code: { value: 'AAAAA' } }
      ]
    }
  ]
};
const BOOKED = 'BOOKED';

(country.hostel || []).forEach(hostel => hostel.room.forEach((room) => {
  room.code.value = BOOKED
}));

console.log(country);