Javascript merge and rename Json objects

Question

Simple problem here: 2 Json objects I would like to merge, while renaming the second.

First Array (obj1):

[  
   {  
      "name":"Metric 1",
      "value":33731487,
   },
   {  
      "name":"Metric 2",
      "value":11252893,
   }
]

Second Array (obj2):

[  
   {  
      "name":"Metric 1",
      "value":118181851,
   },
   {  
      "name":"Metric 2",
      "value":15151,
   }
]

Desired Result:

[  
   {  
      "name":"Metric 1", // Obj1
      "value":118181851, // Obj1
      "name_compare":"Metric 1", // Obj2
      "value_compare":148748, // Obj2
   },
   {  
      "name":"Metric 2", // Obj1
      "value":15151, // Obj1
      "name_compare":"Metric 2", // Obj2
      "value_compare":741178, // Obj2
   }
]

So I tried:

Renaming the Obj2 (works ok):

function JsonRename(obj) {
    var output = {};
    for (i in obj) {
        if (Object.prototype.toString.apply(obj[i]) === '[object Object]') {
            output[i] = JsonRename(obj[i]);
        } else {
            output[i+'_compare'] = obj[i];
        }
    }
    return output;
}

I've then tried to merge them by using:

function JsonMergeCompare(obj1, obj2 ) {

  var renamed_obj2 = JsonRename(obj2);

  var output = {};
  for (i in obj1) {

    output[i] = obj1[i];
    output[i] = renamed_obj2[i];

  }

  return output;

}

My problem is most certainly in the function above, because it only returns the obj2 (which makes sense as I'm iterating over output[i] twice) but how can I get in and change only the key -> values?

can you provide a fiddle or plunkr?

Sujit Y. Kulkarni
– Sujit Y. Kulkarni

2016-02-02 10:32:44 +00:00
Commented Feb 2, 2016 at 10:32 — Sujit Y. Kulkarni
– Sujit Y. Kulkarni, Commented Feb 2, 2016 at 10:32
Why the -1? I think it's a fairly decent question!

nunorbatista
– nunorbatista

2016-02-02 13:12:39 +00:00
Commented Feb 2, 2016 at 13:12 — nunorbatista
– nunorbatista, Commented Feb 2, 2016 at 13:12

Alberto Nicoletti · Accepted Answer · 2016-02-02 10:44:40Z

4

I suggest you to define an Array.zip() function like this:

Array.zip = function(left, right, combinerFunction) {
    var counter, results = [];

    for(counter = 0; counter < Math.min(left.length, right.length); counter++) {
        results.push(combinerFunction(left[counter], right[counter]));
    }

    return results;
};

And then use it to zip the arrays together like this:

var resultArray = Array.zip(array1, array2, function(one, two) {
    return {
        name: one.name, 
        value: one.value,
        name_compare: two.name, 
        value_compare: two.value
    };
});

answered Feb 2, 2016 at 10:44

Alberto Nicoletti

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Comments

HBP · Accepted Answer · 2016-02-02 10:33:03Z

1

As you say the function is the problem.

You need two for loops one per object as follows:

function JsonMergeCompare(obj1, obj2 ) {

  var renamed_obj2 = JsonRename(obj2);

  var output = {};
  for (i in obj1)
    output[i] = obj1[i];
  for (i in renamed_obj2)
    output[i] = renamed_obj2[i];
  return output;
}

answered Feb 2, 2016 at 10:33

HBP

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Comments

erfjax · Accepted Answer · 2016-02-02 11:30:58Z

try this one, I'm sure what is really you want but I just based my answer in your desired output

<script>
//First Array (obj1)
var _obj1=[  
   {  
      "name":"Metric 1",
      "value":33731487,
   },
   {  
      "name":"Metric 2",
      "value":11252893,
   }
];

//Second Array (obj2):
var _obj2=[  
   {  
      "name":"Metric 1",
      "value":118181851,
   },
   {  
      "name":"Metric 2",
      "value":15151,
   },
   {  
      "name":"Metric 3",
      "value":123,
   },

];
	function jsonRename(obj1,obj2){
		var out=[];
		var keys={};
		var ctr=0;
		var indx=0;
		for(v in obj1){
			  if(typeof(obj1[v].name)!="undefined" ){
				 var n=obj1[v].name;
				  if( typeof(keys[n])=="undefined"){
					out.push(obj1[v]);  
					keys[n]=out.length-1;	  
				  }
				  for(v1 in obj2){
					try{
					  if(n==obj2[v1].name){
						 ctr++;
						 out[keys[n]]["name_compare"+ctr]= obj2[v1].name;
						 out[keys[n]]["value_compare"+ctr]= obj2[v1].value;
					  }
					}catch(e){}
				  }
			  }
		}
		 return out;
	}
var out=jsonRename(_obj1,_obj2);

</script>

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