How to Filter Object Fields by a String Array

Question

How can I filter an Object's field by an string array?

eg.

catValues:{
    "1":{
        value:10,
        code:5
     },
    "3":{
        value:10,
        code:5
     },
    "5":{
        value:10,
        code:5
     }
}


var chosenCats = ["1","5"]

result: {"1":{value:10, code:5}, "5":{value:10, code:5}}

Nikhil · Accepted Answer · 2019-09-03 16:28:22Z

1

You create a new object and insert just the chosen cat values.

var chosenCatValues = {};

for (var cat of chosenCats) {
  chosenCatValues[cat] = catValues[cat];
}

Or you can use filter() and reduce():

var chosenCatValues = Object.keys(catValues)
  .filter(key => chosenCats.includes(key))
  .reduce((obj, key) => {
    obj[key] = catValues[key];
    return obj;
  }, {});

Demo:

var catValues = {
  "1": {
    value: 10,
    code: 5
  },
  "3": {
    value: 10,
    code: 5
  },
  "5": {
    value: 10,
    code: 5
  }
};

var chosenCats = ["1", "5"];

var chosenCatValues = Object.keys(catValues)
  .filter(key => chosenCats.includes(key))
  .reduce((obj, key) => {
    obj[key] = catValues[key];
    return obj;
  }, {});

console.log(chosenCatValues);

edited Sep 3, 2019 at 16:28

answered Aug 30, 2019 at 20:33

Nikhil

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Comments

Rohit Kashyap · Accepted Answer · 2019-08-30 18:57:22Z

0

Try this:

Note: This will work with array of strings as well considering they are numbers.

var catValues = {
    "1":{
        value:10,
        code:5
     },
    "3":{
        value:10,
        code:5
     },
    "5":{
        value:10,
        code:5
     }
}

var chosen = ['1','5'];

const func = (chosen, catValues) => {
    var ch = {};
    chosen.map(chose => {
      if(chose in catValues) {
        ch[chose] = catValues[chose]
      }
  })
  return ch
}

console.log(func(chosen, catValues))

edited Aug 30, 2019 at 18:57

answered Aug 30, 2019 at 18:49

Rohit Kashyap

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