Array push object inside an array when a key with some particular name exists

Question

I have an array of objects like below

[
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-07"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-08"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-09"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-10"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-11"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-07"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-08"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-09"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-10"
        ]
    }
},
{
    "medication": {
        "name": "Turbohaler",
        "time": [
            "2018-09-11"
        ]
    }
},
{
    "medication": {
        "name": "Septron",
        "time": [
            "2018-09-07"
        ]
    }
},
{
    "medication": {
        "name": "Septron",
        "time": [
            "2018-09-08"
        ]
    }
},
{
    "medication": {
        "name": "Septron",
        "time": [
            "2018-09-09"
        ]
    }
},
{
    "medication": {
        "name": "Septron",
        "time": [
            "2018-09-10"
        ]
    }
},
{
    "medication": {
        "name": "Septron",
        "time": [
            "2018-09-11"
        ]
    }
}
]

lodash or underscore provided great functions to minimalise the code, but still those libraries didn't help me solve the above problem

I want to achieve something like below

[
  {
    "medication": {
    "name": "Turbohaler",
    "time": [
    "2018-09-07",
    "2018-09-08",
    "2018-09-09",
    "2018-09-10",
    "2018-09-11"
  ]
 }
},
{
 "medication": {
 "name": "Septron",
 "time": [
    "2018-09-07",
    "2018-09-08",
    "2018-09-09",
    "2018-09-10",
    "2018-09-11"
  ]
}

} ]

The above result is formed by grouping an array of objects with same key name (Medication) in our case, and fetching all its values together and merging it into a single object in an array. I have tried different approaches and it failed, If someone could try a bit for above expected output, it will be much appreciated

Thanks in advance

The posted question does not appear to include any attempt at all to solve the problem. StackOverflow expects you to try to solve your own problem first, as your attempts help us to better understand what you want. Please edit the question to show what you've tried, so as to illustrate a specific problem you're having in a minimal reproducible example. For more information, please see How to Ask and take the tour. — CertainPerformance
– CertainPerformance, Commented Sep 11, 2018 at 7:27

Ankit Agarwal · Accepted Answer · 2018-09-11 07:34:10Z

Here is a O(n) solution for the problem you are facing. In addition, use spread syntax on array so that if the time array has multiple items it is handled properly.

var arr = [{
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-07"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-08"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-09"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-10"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-11"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-07"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-08"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-09"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-10"
      ]
    }
  },
  {
    "medication": {
      "name": "Turbohaler",
      "time": [
        "2018-09-11"
      ]
    }
  },
  {
    "medication": {
      "name": "Septron",
      "time": [
        "2018-09-07"
      ]
    }
  },
  {
    "medication": {
      "name": "Septron",
      "time": [
        "2018-09-08"
      ]
    }
  },
  {
    "medication": {
      "name": "Septron",
      "time": [
        "2018-09-09"
      ]
    }
  },
  {
    "medication": {
      "name": "Septron",
      "time": [
        "2018-09-10"
      ]
    }
  },
  {
    "medication": {
      "name": "Septron",
      "time": [
        "2018-09-11"
      ]
    }
  }
];
var tempObj = {};
arr.forEach((item)=>{
  if(!tempObj[item.medication.name]){
    tempObj[item.medication.name] = item;
  } else {
    tempObj[item.medication.name].medication.time.push(...item.medication.time);
  }
});
var res = Object.values(tempObj);
console.log(res);

Nina Scholz · Accepted Answer · 2018-09-11 07:45:04Z

You could take a Map and then collect all values for a given name and render then a new array.

var data = [{ medication: { name: "Turbohaler", time: ["2018-09-07"] } }, { medication: { name: "Turbohaler", time: ["2018-09-08"] } }, { medication: { name: "Turbohaler", time: ["2018-09-09"] } }, { medication: { name: "Turbohaler", time: ["2018-09-10"] } }, { medication: { name: "Turbohaler", time: ["2018-09-11"] } }, { medication: { name: "Turbohaler", time: ["2018-09-07"] } }, { medication: { name: "Turbohaler", time: ["2018-09-08"] } }, { medication: { name: "Turbohaler", time: ["2018-09-09"] } }, { medication: { name: "Turbohaler", time: ["2018-09-10"] } }, { medication: { name: "Turbohaler", time: ["2018-09-11"] } }, { medication: { name: "Septron", time: ["2018-09-07"] } }, { medication: { name: "Septron", time: ["2018-09-08"] } }, { medication: { name: "Septron", time: ["2018-09-09"] } }, { medication: { name: "Septron", time: ["2018-09-10"] } }, { medication: { name: "Septron", time: ["2018-09-11"] } }],
    grouped = Array.from(
        data.reduce((m, { medication: { name, time } }) => m.set(name, (m.get(name) || []).concat(time)), new Map),
        ([name, time]) => ({ medication: { name, time } })
    );
    
console.log(grouped);

.as-console-wrapper { max-height: 100% !important; top: 0; }

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