convert array into object using underscore only

Question

I am learning underscore now and found a task for it I need help with .. I have an array with object looking like this

[
    // ...
    {
            "type": "presence",
            "params": {
                "interval": 15,
                "foo": "something",
                "link": {
                    "fp_type": "1",
                    "fp_ext_id": "2"
            },
    },
    {
            "type": "bar",
            "params": {
                "interval": 30,
                "foo": "foo",
                "link": {
                    "fp_type": "2",
                    "fp_ext_id": "3"
                },
            },
    },
    // ...
]

The task is using underscore only to convert this array items to an object where the the key is the items type and the value are its params, i.e.:

{
  // ...
  "presence": {
    "interval": 15,
    "foo": "something",
    "link": {
        "fp_type": "1",
        "fp_ext_id": "2"
     },
  }, 
  "bar": {
       "interval": 30,
       "foo": "foo",
       "link": {
           "fp_type": "2",
           "fp_ext_id": "3"
       },
  // ...
}

@GeorgeJemptyI could not think of a better title but the question has a slight difference. — Yordan Kanchelov
– Yordan Kanchelov, Commented Dec 23, 2017 at 20:40
If it only has a slight difference you should at least be able to use that to show us some code you actually tried — Dexygen
– Dexygen, Commented Dec 23, 2017 at 20:42
the closest solution I got to this was something like the answer of @hd84335 var y = _.map(x, function(i) { let obj = {}; obj[i.type] = i.params; return obj; }); var result = Object.assign({}, ...y); But I still don't like the solution and think that is not okay with the assignment — Yordan Kanchelov
– Yordan Kanchelov, Commented Dec 23, 2017 at 21:09

hd84335 · Accepted Answer · 2017-12-23 22:50:08Z

2

You can do it this way:

var x = [    
    {
            "type": "presence",
            "params": {
                "interval": 15,
                "foo": "something",
                "link": {
                    "fp_type": "sponsor",
                    "fp_ext_id": "spotme"
                },
            },
    },
    {
            "type": "bar",
            "params": {
                "interval": 30,
                "foo": "foo",
                "link": {
                    "fp_type": "2",
                    "fp_ext_id": "3"
                },
            },
    }
];

var y = _.map(x, function(i) {
  let obj = {};
  obj[i.type] = i.params;
  return obj;
});
//console.log(y);

var result = y.reduce(function(obj,item) {	
  obj[_.keys(item)[0]] = _.values(item)[0]; 
  return obj;
}, {});
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

DEMO

edited Dec 23, 2017 at 22:50

answered Dec 23, 2017 at 16:24

hd84335

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10 Comments

Yordan Kanchelov Over a year ago

this returns array with 2 objects in this example. the point is to convert the array to a single object with key which is the type and value which are the params ( they may be nested )

hd84335 Over a year ago

which type to select as a key if you have multiple types? and for the value, will it be an array?

Yordan Kanchelov Over a year ago

you will have multiple keys in the object with values that come from the params

Yordan Kanchelov Over a year ago

I updated the example to help you understand the task :). the second code snipped should be the returned object composed from the first code snipped

hd84335 Over a year ago

i got what you want! check now how it is done. here is a link on the main problem i think you are facing stackoverflow.com/questions/11508463/…

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