JavaScript - Reduce Array of Objects by Key [duplicate]

Answer 1

Simply create a map with name as key and use Object destructing and Object.values() to get the desired result.

const arr = [
  {name: "qewregf dqewafs", value: "qewregf dqewafs answer", count: 2},
  {name: "survey with select", value: "survey with select answer", count: 2},
  {name: "werasd", value: "Donald", count: 1},
  {name: "werasd", value: "Jim", count: 1}
];

let result = Object.values(arr.reduce((a,{name, ...props})=>{
  if(!a[name])
     a[name]  = Object.assign({}, {name,data : [props]});
   else
    a[name].data.push(props);
  return a;
},{}));

console.log(result);