Grouping in an array object

Question

I have 2 javascript array objects of the following format:

 var input1 = 
    {
      "a" : [
       {
         "id" : 1,
         "name" : "gh"
       }],
      "b" : [
       {
         "id" : 2,
         "name" : "ab"
       }]

    }

var input2 =
{
 "a" : [
       {
         "id" : 3,
         "name" : "cd"
       }],
       "b" : [
       {
         "id" : 4,
         "name" : "gh"
       }]
}

I am looking to format it in the following way :

var finaloutput = 
    {
      "a" : [
       {
         "id" : 1,
         "name" : "gh"
       },
        {
         "id" : 3,
         "name" : "cd"
       }
        ],
      "b" : [
       {
         "id" : 2,
         "name" : "ab"
       },
       {
         "id" : 4,
         "name" : "gh"
       }
      ]      
    }

I am trying to group the array without using any external libraries. Not very much familiar with linq in javascript , any built in functions available or any references?

Edit: I made the changes in the inputs since this is what I am expecting as inputs

Your first block doesn't hold what you think it does, the first "a","b" properties are going to be overwritten by the second set. So its just going to be { a:[{id:3}], b:[{id:4}] } — Patrick Evans
– Patrick Evans, Commented Apr 27, 2016 at 17:29

james emanon · Accepted Answer · 2016-04-27 17:48:39Z

2

Try this, of course this is just a quick implemention - but it should set you on the correct path:

var finaloutput = Object.keys(input1).reduce((p,v) => {
  p[v] = (input1[v].concat(input2[v]))
  return p;
}, {})

returns =>

JSON.stringify(finaloutput, null, 2);

"{
  "a": [
    {
      "id": 1,
      "name": "gh"
    },
    {
      "id": 3,
      "name": "cd"
    }
  ],
  "b": [
    {
      "id": 2,
      "name": "ab"
    },
    {
      "id": 4,
      "name": "gh"
    }
  ]
}"

answered Apr 27, 2016 at 17:48

james emanon

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Comments

Nadir · Accepted Answer · 2016-04-27 17:51:02Z

1

Create a map and fill it checking for key existence, with any given number of inputs

var allInputs = [];
allInputs.push(input1);
allInputs.push(input2);

var result = [];

for(var x in allInputs)
{
    var inp = allInputs[x];
    for(var i in inp)
    {
        if(result[i] == undefined)
        {
            result[i] = [];
        }

        result[i].push(inp[i]);
    }
}

answered Apr 27, 2016 at 17:51

Nadir

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Comments

Abhijeet Chakravorty · Accepted Answer · 2016-04-27 18:50:52Z

    var finalOutput;
    var input1 = {
            "a": [{
                    "id": 1,
                    "name": "gh"
            }],
            "b": [{
                    "id": 2,
                    "name": "ab"
            }]
    };

    var input2 = {
            "a": [{
                    "id": 3,
                    "name": "cd"
            }],
            "b": [{
                    "id": 4,
                    "name": "gh"
            }]
    };
    input1.a.push(input2.a[0]);
    input1.b.push(input2.b[0]);
    finalOutput = input1;

    //////////////////////////////////////////////////////    
    If the arrays are dynamic you can do the operation as follows:

    var input1 = {
        "a": [
          {
                "id": 1,
                "name": "gh"
          }
        ],
        "b": [
          {
                "id": 2,
                "name": "ab"
          }
        ]
}

var input2 = {
        "a": [
          {
                "id": 3,
                "name": "cd"
          }
        ],
        "b": [
          {
                "id": 4,
                "name": "gh"
          }
        ]
}
var inputNewLengthA = input1.a.length;
var inputNewLengthB = input1.b.length;
var finalOutput;
for(var v=0;v<inputNewLengthA;v++){
    input1.a.push(input2.a[v]);
}
for(var n=0;n<inputNewLengthB;n++){
    input1.b.push(input2.b[n]);
}
finalOutput = input1;
///////////////////////////////////////
Note: You can also use one for loop only if your array lengths are   
equal.

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