遍历对象并通过javascript中的键查找值

Question

I have an array of objects, like this

I would like to iterate through an array and find users by specific roomCode

I tried this:

      for(let i=0; i <data.liveRooms.length; i++) {
        if(data.liveRooms[i].roomCode === code) {
          this.usersLive = data.liveRooms[i].users;
        }
      }

And also this:

for(let i=0; i <data.liveRooms.length; i++) {
    this.liveDataDictionary[data.liveRooms[i].roomCode] = 
      data.liveRooms[i].users;
 }
  this.usersLive = this.liveDataDictionary[code];

But nothing works and I don't know why...could you please help me?

Answer 1

According to the screenshot you posted, data.liveRooms[i] is a string, not an object. You could try this inside your for loop:

for(let i=0; i <data.liveRooms.length; i++) {
  let liveRoom = JSON.parse(data.liveRooms[i]);
    if(liveRoom.roomCode === code) {
      ....
    }
}

The JSON.parse() method is a built-in that will convert that string that looks like an object to an actual object. At that point you will be able to get to the dot properties of the object, like .roomCode .

JSON.parse() at MDN .