Compact array of objects using lodash

Question

I have a array of objects, like that first json.

Based in attribute name i want to zip this array in another, like that. If the name is the same with another object, compile the object and set into fields array the others atrrtibutes and values.

[ 
   { 
      "name":"D1D1",
      "attritube":"HOST_NAME",
      "value_inv":"TEST1",
      "value_prod":"TESTA1"
   },
   { 
      "name":"D1D1",
      "attritube":"HOST_NAME",
      "value_inv":"TEST2",
      "value_prod":"TESTB1"
   },
   { 
      "name":"D2D2",
      "attritube":"COMMENTS",
      "value_inv":"TEST1",
      "value_prod":"TESTA1"
   }
]




[ 
   { 
      "name":"D1D1",
      "fields":[ 
         { 
            "attritube":"HOST_NAME",
            "value_inv":"TEST1",
            "value_prod":"TESTA1"
         },
         { 
            "attritube":"HOST_NAME",
            "value_inv":"TEST2",
            "value_prod":"TESTB1"
         }
      ]
   },
   { 
      "name":"D2D2",
      "fields":[ 
         { 
            "attritube":"COMMENTS",
            "value_inv":"TEST1",
            "value_prod":"TESTA1"
         }
      ]
   }
]

Not a perfect match, hence no dupe-vote, but... -> [How to group an array of objects by key](https://stackoverflow.com/questions/40774697/how-to-group-an-array-of-objects-by-key) — Andreas, Oct 07 '19 at 15:37

score 0 · Accepted Answer · answered Oct 10 '19 at 03:09

This isn't pretty and it will not perform very well when you have a very large dataset, but it is functional and produces the output you expect.

const arr = [ 
   { 
      "name":"D1D1",
      "attritube":"HOST_NAME",
      "value_inv":"TEST1",
      "value_prod":"TESTA1"
   },
   { 
      "name":"D1D1",
      "attritube":"HOST_NAME",
      "value_inv":"TEST2",
      "value_prod":"TESTB1"
   },
   { 
      "name":"D2D2",
      "attritube":"COMMENTS",
      "value_inv":"TEST1",
      "value_prod":"TESTA1"
   }
];

const newArr = _.chain(arr)
  .groupBy('name')
  .toPairs()
  .map((val) => ({
    name: val[0],
    fields: _.map(val[1], (v) => _.omit(v, ['name']))
  }))
  .value();
  
console.log(newArr);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>

Thank you, its what i need! – Guilherme Fileto Nov 11 '19 at 20:08 — Guilherme Fileto, Nov 11 '19 at 20:08

Compact array of objects using lodash

1 Answers1