How to filter JavaScript Object by values?

Question

I have a normalized Object like this (for example):

const raw = {
  1: { foo: 1, bar: 1, flag: 0 },
  4: { foo: 4, bar: 4, flag: 1 },
  11: { foo: 11, bar: 11, flag: 0 },
  ...
}

I wanna delete values which have flag: 1.

{
  1: { foo: 1, bar: 1, flag: 0 },
  11: { foo: 11, bar: 11, flag: 0 },
  ...
}

How can I do this immutably?

Any particular reason you're not using an Array, Set, or Map for this? — Brad
– Brad, Commented Sep 1, 2018 at 6:43
@Taichi is it an Array of objects? as you have mentioned in your comment? — amrender singh
– amrender singh, Commented Sep 1, 2018 at 6:47
@Brad I have my data in this format, cuz I can get datum easily like raw[1] . Please see github.com/paularmstrong/normalizr — Taichi
– Taichi, Commented Sep 1, 2018 at 6:47
@amrendersingh no, it is Object. I wanna convert raw like in the question — Taichi
– Taichi, Commented Sep 1, 2018 at 6:48

Mamun · Accepted Answer · 2018-09-01 07:26:15Z

6

You can use Object.values() and Array.prototype.filter()

var obj = {
  1: { foo: 1, bar: 1, flag: 0 },
  2: { foo: 2, bar: 2, flag: 1 },
  3: { foo: 3, bar: 3, flag: 0 }
}
var newobj = Object.assign({}, Object.values(obj).filter(o => o.flag != 1));
console.log(newobj);

You can use reduce() to keep the keys:

var obj = {
  1: { foo: 1, bar: 1, flag: 0 },
  2: { foo: 2, bar: 2, flag: 1 },
  3: { foo: 3, bar: 3, flag: 0 }
}
var newobj = Object.keys(obj).reduce((a,c) => {
  if(obj[c].flag != 1) 
   a[c] = obj[c]; return a;
},{});
console.log(newobj);

edited Sep 1, 2018 at 7:26

answered Sep 1, 2018 at 6:44

Mamun

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1 Comment

Taichi Over a year ago

I think this deletes keys of raw, doesn't it?

seunggabi · Accepted Answer · 2018-09-01 06:45:56Z

2

You can object filtering by lodashjs. https://lodash.com/docs/#filter

_.filter(obj, o => !o.flag);

answered Sep 1, 2018 at 6:45

seunggabi

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Comments

Mohammad Usman · Accepted Answer · 2018-09-01 06:46:44Z

1

You can use Object.keys() and .reduce() methods:

let data = {
  1: { foo: 1, bar: 1, flag: 0 },
  2: { foo: 2, bar: 2, flag: 1 },
  3: { foo: 3, bar: 3, flag: 0 }
};

let result = Object.keys(data).reduce((a, c) => {
  if(data[c].flag !== 1)
    a[c] = Object.assign({}, data[c]);
  
  return a;
}, {});

console.log(result);

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answered Sep 1, 2018 at 6:46

Mohammad Usman

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