JS Object Destructuring with Filter

Question

I have an object of objects I want to filter via the value of a key in the objects. For example, my object looks like:

const Financials = {
  xxxxx: {
    creditid: "yyyy",
    aggRevs: 2000,
    aggexpenses: 1000,
    dateOf: 12 / 31 / 2015
  },
  zzzz: {
    creditid: "yyyy",
    aggRevs: 1000,
    aggexpenses: 1000,
    dateOf: 12 / 31 / 2016
  },
  aaaa: {
    creditid: "bbbb",
    aggRevs: 1000,
    aggexpenses: 1000,
    dateOf: 12 / 31 / 2016
  }
};

I want to be able to filter the object by creditid. For example, I want to return an object that contains all the objects that have a creditid of "yyyy".

var { creditid: "yyyy" } = Financials;

And the result would look like:

{
  xxxxx: {
    creditid: "yyyy",
    aggRevs: 2000,
    aggexpenses: 1000,
    dateOf: 12 / 31 / 2015
  },
  zzzz: {
    creditid: "yyyy",
    aggRevs: 1000,
    aggexpenses: 1000,
    dateOf: 12 / 31 / 2016
  }
}

Is this possible using destructuring?

Answer 1

For that you have to iterate through each property of Financials, as follows:

const Financials = {
  xxxxx: {
    creditid: "yyyy",
    aggRevs: 2000,
    aggexpenses: 1000,
    dateOf: '12 / 31 / 2015'
  },
  zzzz: {
    creditid: "yyyy",
    aggRevs: 1000,
    aggexpenses: 1000,
    dateOf: '12 / 31 / 2016'
  },
  aaaa: {
    creditid: "bbbb",
    aggRevs: 1000,
    aggexpenses: 1000,
    dateOf: '12 / 31 / 2016'
  }
};

var resultFinancials = {};

for (var financial in Financials) {
    if (Financials.hasOwnProperty(financial)) {
        if(Financials[financial] && Financials[financial].creditid =='yyyy' ){
            resultFinancials[financial] = Financials[financial];
        }
    }
}

console.log(resultFinancials)

Answer 2

As far as destructuring goes, I don't know that this can be done, simply because destructuring works more like .map() than .filter() . However, you can actually do this pretty easily with the .reduce() function, like so:

 const Financials = { xxxxx: { creditid: "yyyy", aggRevs: 2000, aggexpenses: 1000, dateOf: 12 / 31 / 2015 }, zzzz: { creditid: "yyyy", aggRevs: 1000, aggexpenses: 1000, dateOf: 12 / 31 / 2016 }, aaaa: { creditid: "bbbb", aggRevs: 1000, aggexpenses: 1000, dateOf: 12 / 31 / 2016 } }; var filtered = Object.keys(Financials).reduce((res, key) => { if (Financials[key].creditid === "yyyy") { res[key] = Financials[key] } return res; }, {}); console.log(filtered); 

Answer 3

You could just filter the objects entries, and then map it back to new object

 const Financials = { xxxxx: { creditid: "yyyy", aggRevs: 2000, aggexpenses: 1000, dateOf: 12 / 31 / 2015 }, zzzz: { creditid: "yyyy", aggRevs: 1000, aggexpenses: 1000, dateOf: 12 / 31 / 2016 }, aaaa: { creditid: "bbbb", aggRevs: 1000, aggexpenses: 1000, dateOf: 12 / 31 / 2016 } }; let arr = Object.entries(Financials).filter( set => set[1].creditid === "yyyy"); let result = Object.assign(...arr.map(d => ({[d[0]]: d[1]}))) console.log(result) 

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