CODEWITHSUNDEEP
javascriptecmascript-6
Taichi
Taichi

Reputation: 2587

How to filter JavaScript Object by values?

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?

Upvotes: 1

Views: 93

Answers (3)

Mamun
Mamun

Reputation: 68943

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);

Upvotes: 6

Mohammad Usman
Mohammad Usman

Reputation: 39332

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);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 1

seunggabi
seunggabi

Reputation: 1822

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

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

Upvotes: 2

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