How to add property to object in array [duplicate]

Question

I've a data like this.

const arr = [
  {name:'john'},
  {name:'jeff'},
  {name:'bob'},
  {name:'peter'},
]

arr.forEach((v,i,a)=>{
  console.log(v)
})

And I want to transfer to

arr = [{id:1,name:john},{id:2,name:jeff},{id:3,name:bob},{id:4,name:peter}]

I want to add id to every object in array.

How to solves this, Thank you.

Have you looked at the documentation of forEach?

Sebastian Simon
– Sebastian Simon

2022-10-25 17:43:12 +00:00
Commented Oct 25, 2022 at 17:43 — Sebastian Simon
– Sebastian Simon, Commented Oct 25, 2022 at 17:43

Konrad · Accepted Answer · 2022-10-25 17:42:55Z

1

const arr = [
  {name:'john'},
  {name:'jeff'},
  {name:'bob'},
  {name:'peter'},
]

arr.forEach((v,i,a)=>{
  v.id = i + 1
})

console.log(arr)

answered Oct 25, 2022 at 17:42

Konrad

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Comments

Rohìt Jíndal · Accepted Answer · 2022-10-25 17:43:42Z

1

Try this :

const arr = [
  {name:'john'},
  {name:'jeff'},
  {name:'bob'},
  {name:'peter'},
];

const res = arr.map((obj, index) => {
   return {
     ...obj,
     id: index + 1
   }
});

console.log(res);

answered Oct 25, 2022 at 17:43

Rohìt Jíndal

27.4k16 gold badges80 silver badges133 bronze badges

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