How to find index of a JSON array in Angular4?

Question

I have a JSON array:

data = [{"user_id":22},{"user_id":12}];

1) I need to find the index of an element. I use the method:

     var value = 22;
     var index = -1;
     var res = this.data.find(function(item, i){
      if(item.user_id === val){
      index = i;
      return i;
      }
     });
     console.log(index, res);

But the problem is that I got index 0 all the time.

2) I need to use the same array in the format:

"test" :{
        "users":[{"user_id":22},
                 {"user_id":12}
                ]
      }

when I use this format:

"test":{
        "users":this.data
        }

but it gives Array(0).

I didn't find anything wrong. Help will be appreciated.

This should be a javascript question not angular

user10271701
– user10271701

2018-08-30 04:42:57 +00:00
Commented Aug 30, 2018 at 4:42 — user10271701
– user10271701, Commented Aug 30, 2018 at 4:42

Krishna Rathore · Accepted Answer · 2018-08-30 06:03:41Z

1

use findIndex for this

data = [{"user_id":22},{"user_id":12}];

let indx =data.findIndex(item=>item.user_id == 12);

answered Aug 30, 2018 at 6:03

Krishna Rathore

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Comments

Mahendra Hirapra · Accepted Answer · 2018-08-30 06:33:02Z

1

Use findIndex method

var indexNum =[{"user_id":22},{"user_id":12}].findIndex((element)=> {
  return (element.user_id == 22);
});

edited Aug 30, 2018 at 6:33

Mahendra Hirapra

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answered Aug 30, 2018 at 3:41

ranjeet8082

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