Merge duplicate value in JSON array (underscore or lodash preferable)

Question

I want to merge JSON arrays' some object which have duplicate values of specific key.

I have json Array Like this:

var data=[
    { type:"XO",
      logID:"213323",
      user:"34324234"
    },
    { type:"YO",
      logID:"2323323",
      user:"1212234"
    },
    { type:"XO",
      logID:"676323323",
      user:"45465412234"
    },
    ,
    { type:"ZO",
      logID:"1231434323",
      user:"35739434"
    }
]

Here I want to merge JSON Objects based on key 'type'. so same type will look like this with new key:

var expectedOutput:[
     { 
        type:XO,
        text: [
            {
              logID:"213323",
              user:"34324234"
            },
            {
              logID:"676323323",
              user:"45465412234"
            }
        ]
     },
     { type:"YO",
       text:[
         {
         logID:"2323323",
         user:"1212234"
        }  
      ]
     },
     {
       type:"ZO",
       text:[ 
           {
             logID:"1231434323",
             user:"35739434"
           } 
        ]
     }
]

ryeballar · Accepted Answer · 2017-07-06 23:41:43Z

2

You can use lodash#groupBy to group the collection by type, use lodash#map to transform each group object format into a group array format. To remove the type property from the array of text, we'll use a partailly applied lodash#omit function using lodash#partial.

var result = _(data)
  .groupBy('type')
  .map(function(group, type) {
    return {
      type: type,
      text: _.map(group, _.partial(_.omit, _, 'type'))
    };
  })
  .value();

var data = [{
    type: "XO",
    logID: "213323",
    user: "34324234"
  },
  {
    type: "YO",
    logID: "2323323",
    user: "1212234"
  },
  {
    type: "XO",
    logID: "676323323",
    user: "45465412234"
  },
  {
    type: "ZO",
    logID: "1231434323",
    user: "35739434"
  }
];

var result = _(data)
  .groupBy('type')
  .map(function(group, type) {
    return {
      type: type,
      text: _.map(group, _.partial(_.omit, _, 'type'))
    };
  })
  .value();
  
console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

edited Jul 6, 2017 at 23:41

answered Jul 6, 2017 at 23:07

ryeballar

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1 Comment

ryeballar Over a year ago

I'ts because your input after the third item of the array is empty. I'll remove that from the input. You will notice that there are two commas "," after the third item in your data input.

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