How to remove key+value pair from an object of Array

Question

I want to remove property 'b' from all objects how i remove???

 let result=[
    {
       'id':'1',
       'b':'asd'
    },
    {
       'id':'2',
       'b':'asd'
    },
    ...
    ,
    { 
       'id':'2000',
       'b':'asd'
    },
 ]  
  // delete object.b; its only for object and want to remove from whole 
   //  array 2000 records

Using foreach loop is it correct way to delete key + value pair from array of objects

@Tibrogargan, no, `map` creates a new array. You need to mutate the original one. — Mihai Alexandru-Ionut, Jan 23 '18 at 07:22
@MihaiAlexandru-Ionut Why? The old one will get marked for deletion and the `result` variable will hold and new array with the same references — Tibrogargan, Jan 23 '18 at 07:24

FrontTheMachine · Accepted Answer · 2018-01-23T07:16:52.630

3

if that one is the only structure you have you can do this

result = result.map(e => ({ id: e.id }))

or if the structure is far more complicated, you might want to use delete:

result.forEach((e) => {
    delete e.b;
});

edited Jan 23 '18 at 07:16

answered Jan 23 '18 at 07:14

FrontTheMachine

526
3
14

Not what was asked. You're assuming the only key in the members of `result` are `id` and `b` – Tibrogargan Jan 23 '18 at 07:16
edited to include the generic case – FrontTheMachine Jan 23 '18 at 07:17

lucky · Answer 2 · 2018-01-23T07:20:14.923

1

You could use forEach.

 let result=[
    {
       'id':'1',
       'b':'asd'
    },
    {
       'id':'2',
       'b':'asd'
    },
    { 
       'id':'2000',
       'b':'asd'
    },
 ];
result.forEach(function(item){ delete item.b });
console.log(result);

edited Jan 23 '18 at 07:20

answered Jan 23 '18 at 07:18

lucky

12,734
4
24
46

1

Why do you need jquery here ? – Mihai Alexandru-Ionut Jan 23 '18 at 07:18
Thanks for reminding. It is habit :) – lucky Jan 23 '18 at 07:21

score 0 · Answer 3 · answered Jan 23 '18 at 07:17

0

Try following code:

let result=[
    {
       'id':'1',
       'b':'asd'
    },
    {
       'id':'2',
       'b':'asd'
    },
    { 
       'id':'2000',
       'b':'asd'
    }
 ];
 
 for(let i in result){
    let obj = result[i];
    delete obj['b'];
 }
 console.log(result);

Hope it helps :)

answered Jan 23 '18 at 07:17

jasmin_makasana

472
3
11

Yes it Helps me. But Is it right way to do that. because result contain 4000 records. so using it needs for loop and its run 4000 times – Aniket kale Mar 26 '18 at 10:17

How to remove key+value pair from an object of Array

3 Answers3

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