Group array of objects based on a key and return the new array of objects

Issue

I am having the below array of object on which I want to perform group based on entity name and I have see if two objects have same entity Name if yes then I have to see the color if color of both objects are same then I have to group them into one and combine the details of both.

If entity Name of two objects are same and color is different then I have to group them and set color as yellow and have to combine the details and return back the new array of objects.

let data = [
    {entityName: "Amazon", color: "red", details: "Hello"}
    {entityName: "Amazon", color: "green", details: "World"}
    {entityName: "Flipkart", color: "green", details: "1234567"} 
]

My excepted output from the above array should be this.

result = [
    {entityName: "Amazon", color: "yellow", details: "Hello world"}
    {entityName: "Flipkart", color: "green", details: "1234567"} 
]

Could anyone please tell me how can I do it?

Solution

You can just iterate over items and find a matching item and implement your logic.

let data = [{
    entityName: "Amazon",
    color: "red",
    details: "Hello"
  },
  {
    entityName: "Amazon",
    color: "green",
    details: "World"
  },
  {
    entityName: "Flipkart",
    color: "green",
    details: "1234567"
  }
];

var result = [];
for (const value of data) {
  const item = result.find(f => f.entityName === value.entityName);
  if (!item) {
    result.push(value);
  } else {
    if (item.color !== value.color) {
      item.color = 'yellow';
    }
    item.details += ' ' + value.details;
  }
}
console.log(result);

Answered By - Nikhil Patil