Failed to push an array of objects into another array in JavaScript

Question

Failed to push an array of objects into another array in JavaScript

In my scenario, I am working with an array of rooms within an asylum.

 var rooms = [
    {
      "id": 1001,
      "room": "room 1"
    },
    {
      "id": 1002,
      "room": "room 2"
    },
    {
      "id": 1003,
      "room": "room 3"
    },
    {
      "id": 1004,
      "room": "room 4"
    }
  ];

Furthermore, there is a list of patients associated with this asylum.

 var patients = [
    {
        "id": 10,
        "room": "room 1",
        "patient_name": "John"
    },
    {
        "id": 11,
        "room": "room 1",
        "member_name": "Jane"
    },
    {
        "id": 12,
        "room": "room 1",
        "member_name": "Joe"
    },
    {
        "id": 20,
        "room": "room 2",
        "patient_name": "Matt"
    },
    {
        "id": 30,
        "room": "room 3",
        "patient_name": "Alexa"
    }
  ];

Each patient is assigned to a specific room. My goal is to organize these patients under their respective rooms and create a new array structure as follows:

  var asylum = [
    {
      "id": 1001,
      "room": "room 1",
      "patients": [
        {
          "id": 10,
          "room": "room 1",
          "patient_name": "John"
        },
        {
          "id": 11,
          "room": "room 1",
          "member_name": "Jane"
        },
        {
          "id": 12,
          "room": "room 1",
          "member_name": "Joe"
        }
      ]
    },
    {
      "id": 1002,
      "room": "room 2",
      "patients": [
        {
          "id": 20,
          "room": "room 2",
          "patient_name": "Matt"
        }
      ]
    },
    {
      "id": 1003,
      "room": "room 3",
      "patients": [
        {
          "id": 30,
          "room": "room 3",
          "patient_name": "Alexa"
        }
      ]
    },
    {
      "id": 1004,
      "room": "room 4",
      "patients": []
    }
  ]

I have shared the code snippets that are intended to achieve this result, but it seems like I am encountering issues in implementation.

for (var i = 0, len = rooms.length; i < len; i++) {
  for (var j = 0, len2 = patients.length; j < len2; j++) {
    if (rooms[i].room === patients[j].room) {
      rooms[i].members = patients[j];
    }
  }
}

I created a Fiddle to troubleshoot the problem. Upon inspecting the console output, it appears that only one element is being pushed, which deviates from my expected outcome.

javascript arrays

Answer 1

Answer №1

Ensure you are correctly updating the rooms[i].members value whenever a new patient is identified. Modify your code to include pushing the new patient into the array:

for (let i = 0; i < rooms.length; i++) {
  for (let j = 0; j < patients.length; j++) {
    if (rooms[i].room === patients[j].room) {
        if (!rooms[i].members) { //initialize the array when the first patient is found for this room
            rooms[i].members = [];
        }
        rooms[i].members.push(patients[j]);
    }
  }
}

Answer 2

Ensure you are correctly updating the rooms[i].members value whenever a new patient is identified. Modify your code to include pushing the new patient into the array:

for (let i = 0; i < rooms.length; i++) {
  for (let j = 0; j < patients.length; j++) {
    if (rooms[i].room === patients[j].room) {
        if (!rooms[i].members) { //initialize the array when the first patient is found for this room
            rooms[i].members = [];
        }
        rooms[i].members.push(patients[j]);
    }
  }
}

Answer 3

Answer №2

In order to efficiently organize the patients into rooms, you can implement a solution using a hash table and a two-loop method. First, generate an asylum array by assigning a hash value to each room. Then use a second loop to allocate patients to their respective rooms.

var rooms = [{ id: 1001, room: "room 1" }, { id: 1002, room: "room 2" }, { id: 1003, room: "room 3" }, { id: 1004, room: "room 4" }],
    patients = [{ id: 10, room: "room 1", patient_name: "John" }, { id: 11, room: "room 1", member_name: "Jane" }, { id: 12, room: "room 1", member_name: "Joe" }, { id: 20, room: "room 2", patient_name: "Matt" }, { id: 30, room: "room 3", patient_name: "Alexa" }],
    hash = Object.create(null),
    asylum = rooms.map(function (o) {
        return hash[o.room] = { id: o.id, room: o.room, patients: [] };
    });

patients.forEach(function (o) {
    hash[o.room].patients.push(o);
});

console.log(asylum);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 4

In order to efficiently organize the patients into rooms, you can implement a solution using a hash table and a two-loop method. First, generate an asylum array by assigning a hash value to each room. Then use a second loop to allocate patients to their respective rooms.

var rooms = [{ id: 1001, room: "room 1" }, { id: 1002, room: "room 2" }, { id: 1003, room: "room 3" }, { id: 1004, room: "room 4" }],
    patients = [{ id: 10, room: "room 1", patient_name: "John" }, { id: 11, room: "room 1", member_name: "Jane" }, { id: 12, room: "room 1", member_name: "Joe" }, { id: 20, room: "room 2", patient_name: "Matt" }, { id: 30, room: "room 3", patient_name: "Alexa" }],
    hash = Object.create(null),
    asylum = rooms.map(function (o) {
        return hash[o.room] = { id: o.id, room: o.room, patients: [] };
    });

patients.forEach(function (o) {
    hash[o.room].patients.push(o);
});

console.log(asylum);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 5

Answer №3

Loop through the list of patients and for each patient, compare their assigned room with the available rooms. If a match is found, include the patient in the corresponding room's list.

var rooms = [{"id": 1001, "room": "room 1"}, {"id": 1002, "room": "room 2"}, {"id": 1003, "room": "room 3"}, {"id": 1004, "room": "room 4"}];

var patients = [{"id": 10, "room": "room 1", "patient_name": "John"}, { "id": 11, "room": "room 1", "member_name": "Jane"}, {"id": 12, "room": "room 1", "member_name": "Joe"}, {"id": 20, "room": "room 2", "patient_name": "Matt"}, {"id": 30, "room": "room 3", "patient_name": "Alexa"}];
  
patients.forEach(patient => {
    var room = rooms.find(room => patient.room === room.room);
    
    if(room) {
         
       if(!room.patients) {
          room.patients = [];
       }
      
       room.patients.push(patient);
    }

 });
 
 console.log(rooms);

Answer 6

Loop through the list of patients and for each patient, compare their assigned room with the available rooms. If a match is found, include the patient in the corresponding room's list.

var rooms = [{"id": 1001, "room": "room 1"}, {"id": 1002, "room": "room 2"}, {"id": 1003, "room": "room 3"}, {"id": 1004, "room": "room 4"}];

var patients = [{"id": 10, "room": "room 1", "patient_name": "John"}, { "id": 11, "room": "room 1", "member_name": "Jane"}, {"id": 12, "room": "room 1", "member_name": "Joe"}, {"id": 20, "room": "room 2", "patient_name": "Matt"}, {"id": 30, "room": "room 3", "patient_name": "Alexa"}];
  
patients.forEach(patient => {
    var room = rooms.find(room => patient.room === room.room);
    
    if(room) {
         
       if(!room.patients) {
          room.patients = [];
       }
      
       room.patients.push(patient);
    }

 });
 
 console.log(rooms);

Answer 7

Answer №4

My code snippet showcases the importance of consistency with variable names, as using "patient_name" and "member_name" interchangeably can lead to errors.

    var asylum = [];


 var rooms = [
    {
      "id": 1001,
      "room": "room 1"
    },
    {
      "id": 1002,
      "room": "room 2"
    },
    {
      "id": 1003,
      "room": "room 3"
    },
    {
      "id": 1004,
      "room": "room 4"
    }
  ];

 var patients = [
    {
        "id": 10,
        "room": "room 1",
        "patient_name": "John"
    },
    {
        "id": 11,
        "room": "room 1",
        "patient_name": "Jane"
    },
    {
        "id": 12,
        "room": "room 1",
        "patient_name": "Joe"
    },
    {
        "id": 20,
        "room": "room 2",
        "patient_name": "Matt"
    },
    {
        "id": 30,
        "room": "room 3",
        "patient_name": "Alexa"
    }
  ];
  
  var asylum = [];
  
var aRoomWithPatients,apatient,rooma,roomb,name;
for (var i = 0; i < rooms.length; i++) {
   aRoomWithPatients = {};
   aRoomWithPatients.id = rooms[i].id;
   aRoomWithPatients.room = rooms[i].room;
   aRoomWithPatients.patients = [];
   asylum.push(aRoomWithPatients);
  for (var j = 0; j < patients.length;  j++) {
  rooma = rooms[i].room;
  roomb = patients[j].room;
  name = patients[j].patient_name;
    if (rooma === roomb) {
apatient = {};
apatient.id = patients[j].id;
apatient.room = patients[j].room;
apatient.patient_name = name;
        asylum[i].patients.push(apatient);
    }
  }
}
console.log(asylum);

Answer 8

My code snippet showcases the importance of consistency with variable names, as using "patient_name" and "member_name" interchangeably can lead to errors.

    var asylum = [];


 var rooms = [
    {
      "id": 1001,
      "room": "room 1"
    },
    {
      "id": 1002,
      "room": "room 2"
    },
    {
      "id": 1003,
      "room": "room 3"
    },
    {
      "id": 1004,
      "room": "room 4"
    }
  ];

 var patients = [
    {
        "id": 10,
        "room": "room 1",
        "patient_name": "John"
    },
    {
        "id": 11,
        "room": "room 1",
        "patient_name": "Jane"
    },
    {
        "id": 12,
        "room": "room 1",
        "patient_name": "Joe"
    },
    {
        "id": 20,
        "room": "room 2",
        "patient_name": "Matt"
    },
    {
        "id": 30,
        "room": "room 3",
        "patient_name": "Alexa"
    }
  ];
  
  var asylum = [];
  
var aRoomWithPatients,apatient,rooma,roomb,name;
for (var i = 0; i < rooms.length; i++) {
   aRoomWithPatients = {};
   aRoomWithPatients.id = rooms[i].id;
   aRoomWithPatients.room = rooms[i].room;
   aRoomWithPatients.patients = [];
   asylum.push(aRoomWithPatients);
  for (var j = 0; j < patients.length;  j++) {
  rooma = rooms[i].room;
  roomb = patients[j].room;
  name = patients[j].patient_name;
    if (rooma === roomb) {
apatient = {};
apatient.id = patients[j].id;
apatient.room = patients[j].room;
apatient.patient_name = name;
        asylum[i].patients.push(apatient);
    }
  }
}
console.log(asylum);

Failed to push an array of objects into another array in JavaScript

Answer №1

Answer №2

Answer №3

Answer №4

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