What is the best way to classify Arrays and Objects together?

I am facing a situation where I have an array containing 3 Objects, but the second Object does not include an array inside the 'Data' Object.

My main challenge is to loop through each 'Artist' in the correct order using ng-repeat, but the second object is causing some issues. How can I merge all Objects together?

In my Factory, I have set up calls to fetch three responses from three different APIs. I have created separate promises for each API call so that they are received in the exact order they were requested.

FACTORY

.factory('timeline', function($http, $q) {    

    var promise1 = $http({
        method: "GET",
        url: "http://api.example.com/last/3/?limit=3"
    });
    var promise2 = $http({
        method: "GET",
        url: "http://api.example.com/current/3/"
    });
    var promise3 = $http({
        method: "GET",
        url: "http://api.example.com/next/3/?limit=3"
    });

    return {
       data: $q.all([promise1, promise2, promise3])
    }

})

In my controller, I handle the response like this:

[
Object
   config 
   data: [Array 3]
     -0: Object 
         artist : 'Artist'
         title  : 'Title'
     -1: Object
     -2: Object,

Object
   config 
   data: Object
     artist : 'Artist'
     title  : 'Title',

Object
   config 
   data: [Array 3]
     -0: Object 
         artist : 'Artist'
         title  : 'Title'
     -1: Object
     -2: Object
]

CONTROLLER

My Attempt to filter using Underscore:

.controller('StationCtrl', function($scope, $stateParams, $http, timeline) {

timeline.data.then(function(musicData) {
    var row = [];
    for (var i = 0; i < musicData.length; i++) {
        var data = _.filter(musicData[i].data, function(x){
            row.push(x);
        })         
    }       
})
})

My Goal: Eventually, if possible, I would like to combine everything in order:

Object
   data: [Array 7]
     -0: Object 
     -1: Object
     -2: Object
     -3: Object
     -4: Object
     -5: Object
     -6: Object,

I am still learning how to work with Objects and Arrays, any help or tips would be greatly appreciated.

Answer №1

Here is a straightforward method to resolve your issue without using underscores. Simply determine whether your data is in the form of an object or an array.

var items = [
  { info: [{ name: 'John' }, { name: 'Jane' }]},
  { info: { name: 'Alice' } },
  { info: [{ name: 'Bob' }]}
];

var updatedItems = [];

items.forEach(function (element) {
  if(Array.isArray(element.info)) {
    updatedItems = updatedItems.concat(element.info);
  } else {
    updatedItems.push(element.info);
  }
});

View a demonstration on jsbin.

Answer №2

In my opinion, the best approach would be to send an array specifically for the second object with a length of 1. If you do not have control over the API, such as if it is a third-party service or something else, we can explore alternative solutions to address the issue.

Answer №3

To simplify the code, you can remove the underscore and use a nested for loop instead:

.controller('StationCtrl', function($scope, $stateParams, $http, timeline) {

timeline.data.then(function(musicData) {
    var row = [];
    var dataElement;
    var i;
    var j;
    for (i = 0; i < musicData.length; i++) {
        dataElement = musicData[i].data;
        if(typeof dataElement === 'object') {
            row.push(dataElement)
        } else if(typeof dataElement === 'array') {
            for(j = 0; j < dataElement.length; j++) {
                row.push(dataElement[j]);
            }
        }        
    }       
})
})

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