How to merge array of objects if duplicate values are there, if key is common then merge common values in single key [duplicate]

Question

This is an input array of object

var array= [
    { name : "c", arr: "d" },
    { name : "a", arr: "b" },
    { name : "c", arr: "e" },
    { name : "a", arr: "b" },
    { name : "c", arr: "d" }
];

result should be like

var result =[
     { name : "c", arr: "d,e" },
     { name : "a", arr: "b" }
]

@CertainPerformance look proper to question this differs from as you mentioned — Ajay yadav
– Ajay yadav, Commented Aug 29, 2019 at 8:22
if I have no idea how can I post my effort dude @CertainPerformance — Ajay yadav
– Ajay yadav, Commented Aug 29, 2019 at 8:26

Jack Bashford · Accepted Answer · 2019-08-29 07:50:51Z

3

Use reduce, a Set to store the unique letters, then join them together with map at the end:

var array= [
    { name : "c", arr: "d" },
    { name : "a", arr: "b" },
    { name : "c", arr: "e" },
    { name : "a", arr: "b" },
    { name : "c", arr: "d" }
];

const res = Object.values(array.reduce((a, { name, arr }) => {
  a[name] = a[name] || { name, arr: new Set() };
  a[name].arr.add(arr);
  return a;
}, {})).map(({ name, arr }) => ({ name, arr: [...arr].join(",")}));

console.log(res);

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edited Aug 29, 2019 at 7:50

answered Aug 29, 2019 at 5:24

Jack Bashford

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