Compare array of objects and merge data if matched

Question

I want to compare objects in array of objects based on a property value if property value of two objects match then I want to merge them my data looks like the below given array of objects.

[{
        "master": "filpkart",
        "business": [{
                "label": "flipkart process",
                "value": "flipkart.process"
            }
        ]
    }, {
        "master": "amazon",
        "business": [{
                "label": "amazon process",
                "value": "amazon.process"
            }
        ]
    }, {
        "master": "chat",
        "business": [{
                "label": "chat process",
                "value": "chat.process"
            }
        ]
    }, {
        "master": "flipkart",
        "business": [{
                "label": "flipkart1 process",
                "value": "flipkart1.process"
            }
        ]
    }
]

after comparing the above arary of objects my output should look like this

[{
        "master": "filpkart",
        "business": [{
                "label": "flipkart process",
                "value": "flipkart.process"
            },
            {
                "label": "flipkart1 process",
                "value": "flipkart1.process"
            }
            
        ]
    }, {
        "master": "amazon",
        "business": [{
                "label": "amazon process",
                "value": "amazon.process"
            }
        ]
    }, {
        "master": "chat",
        "business": [{
                "label": "chat process",
                "value": "chat.process"
            }
        ]
    }
]

could anyone please tell me how can I achieve this

what does not work? please add your code.

Nina Scholz
– Nina Scholz

2020-10-22 07:04:28 +00:00
Commented Oct 22, 2020 at 7:04 — Nina Scholz
– Nina Scholz, Commented Oct 22, 2020 at 7:04
@NinaScholz I have no idea how to approach this

Zahid Hussain
– Zahid Hussain

2020-10-22 07:10:27 +00:00
Commented Oct 22, 2020 at 7:10 — Zahid Hussain
– Zahid Hussain, Commented Oct 22, 2020 at 7:10

Hoang Dao · Accepted Answer · 2020-10-22 07:24:41Z

Just play with Map:

const input = [{
  "master": "flipkart",
  "business": [{
          "label": "flipkart process",
          "value": "flipkart.process"
      }
  ]
}, {
  "master": "amazon",
  "business": [{
          "label": "amazon process",
          "value": "amazon.process"
      }
  ]
}, {
  "master": "chat",
  "business": [{
          "label": "chat process",
          "value": "chat.process"
      }
  ]
}, {
  "master": "flipkart",
  "business": [{
          "label": "flipkart1 process",
          "value": "flipkart1.process"
      }
  ]
}];

const result = Array.from(input.reduce((itemMap, value) => {
  if (itemMap.has(value.master)) {
    const business = itemMap.get(value.master).business.concat(value.business);
    itemMap.set(value.master, {...value, business });
  } else {
    itemMap.set(value.master, value);
  }

  return itemMap;
}, new Map()).values());

console.log(result);

Nina Scholz · Accepted Answer · 2020-10-22 07:31:24Z

Assuming you have two master: "flipkart", you could take an object fro grouping and get the values as result set.

const
    data = [{ master: "flipkart", business: [{ label: "flipkart process", value: "flipkart.process" }] }, { master: "amazon", business: [{ label: "amazon process", value: "amazon.process" }] }, { master: "chat", business: [{ label: "chat process", value: "chat.process" }] }, { master: "flipkart", business: [{ label: "flipkart1 process", value: "flipkart1.process" }] }],
    grouped = Object.values(data.reduce((r, { master, business }) => {
        r[master] ??= { master, business: [] };
        r[master].business.push(...business);
        return r;
    }, {}));

console.log(grouped);

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

brk · Accepted Answer · 2020-10-22 07:44:12Z

You can use Map and forEach

let data = [{
  "master": "flipkart",
  "business": [{
    "label": "flipkart process",
    "value": "flipkart.process"
  }]
}, {
  "master": "amazon",
  "business": [{
    "label": "amazon process",
    "value": "amazon.process"
  }]
}, {
  "master": "chat",
  "business": [{
    "label": "chat process",
    "value": "chat.process"
  }]
}, {
  "master": "flipkart",
  "business": [{
    "label": "flipkart1 process",
    "value": "flipkart1.process"
  }]
}]
// initiate a new map 
let map = new Map();
data.forEach((item) => {
  // check if map have a key same as value of master in current object in iteration
  const mapData = map.get(item.master);
  // if not the set the key like flipkart, amazon..
  if (!mapData) {
    map.set(item.master, item)
  } else {
   // if already have the key the update the business array 
    map.get(item.master).business = map.get(item.master).business.concat(item.business)
  }

});
let formattedArr = []
// converting array of arrays 
for (let [k, v] of map.entries()) {
  formattedArr.push(v)

};
console.log(formattedArr)

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