CODEWITHSUNDEEP
javascriptobject
Vlad
Vlad

Reputation: 55

How to copy the values of an object into the keys of another object?

I have 2 Objects.

Object1:

      {
         "a": "XXXXX",
         "b": "YYYYY",
         "c": "ZZZZZ"
      }

and Object2:

    {
        "a": "KKKKK",
        "b": "LLLLL",
        "c": "MMMMM"
    }

both have the same length and same keys at the same index, but different values.

Result should be:

    {
        "XXXXX": "KKKKK",
        "YYYYY": "LLLLL",
        "ZZZZZ": "MMMMM"
    }

i've tried:

    for (let el in Object2){
      el = Object1[el]      
    }

but its not working. What i'm doing wrong?

Upvotes: 1

Views: 134

Answers (6)

adiga
adiga

Reputation: 35222

You can loop through the keys and set the key and value of the output object based on the value in the input objects

const o1 = { a: "XXXXX", b: "YYYYY", c: "ZZZZZ" },
      o2 = { a: "KKKKK", b: "LLLLL", c: "MMMMM" },
      output = {};

for (let key in o1)
  output[o1[key]] = o2[key]

console.log(output)

Upvotes: 0

Aziz.G
Aziz.G

Reputation: 3721

you can use Object.Values + reduce something like this:

const a = {
  "a": "XXXXX",
  "b": "YYYYY",
  "c": "ZZZZZ"
}


const b = {
  "a": "KKKKK",
  "b": "LLLLL",
  "c": "MMMMM"
}

var res = Object.values(a).reduce((newObject, value, index) => {
  newObject[value] = Object.values(b)[index]
  return newObject;
}, {});

console.log(res)

Upvotes: 0

Amardeep Bhowmick
Amardeep Bhowmick

Reputation: 16908

We can use Array.prototype.reduce and Object.entries to iterate over the keys of the first object and use its values as the keys for the result object:

const obj1 = {
         "a": "XXXXX",
         "b": "YYYYY",
         "c": "ZZZZZ"
      }
const obj2 = {
        "a": "KKKKK",
        "b": "LLLLL",
        "c": "MMMMM"
    } 
const result = Object.entries(obj1).reduce((acc, ele) => {
  acc[ele[1]] = obj2[ele[0]];
  return acc;
}, {});
console.log(result);

Upvotes: 0

Djaouad
Djaouad

Reputation: 22776

You can also use Object.assign with Object.values:

var obj1 = {
  "a": "XXXXX",
  "b": "YYYYY",
  "c": "ZZZZZ"
};

var obj2 = {
  "a": "KKKKK",
  "b": "LLLLL",
  "c": "MMMMM"
};

var obj3 = Object.assign(...Object.values(obj1).map((k, i) => ({[k]: Object.values(obj2)[i]})));

console.log(obj3);

Or, use a forEach:

var obj1 = {
  "a": "XXXXX",
  "b": "YYYYY",
  "c": "ZZZZZ"
};

var obj2 = {
  "a": "KKKKK",
  "b": "LLLLL",
  "c": "MMMMM"
};

var obj3 = {};

Object.values(obj1).forEach((key, i) => obj3[key] = Object.values(obj2)[i]);

console.log(obj3);

Upvotes: 0

Amardeep Bhowmick
Amardeep Bhowmick

Reputation: 16908

We can use Array.prototype.reduce and Object.keys to iterate over the keys of the first object and use its values as the keys for the result object:

const obj1 = {
         "a": "XXXXX",
         "b": "YYYYY",
         "c": "ZZZZZ"
      }
const obj2 = {
        "a": "KKKKK",
        "b": "LLLLL",
        "c": "MMMMM"
    } 
const result = Object.keys(obj1).reduce((acc, ele, idx) => {
  acc[obj1[ele]] = obj2[ele];
  return acc;
}, {});
console.log(result);

Upvotes: 0

Hero Qu
Hero Qu

Reputation: 951

const x = {
   "a": "XXXXX",
   "b": "YYYYY",
   "c": "ZZZZZ"
}

const y = {
  "a": "KKKKK",
  "b": "LLLLL",
  "c": "MMMMM"
} 

const z = Object.keys(x).reduce((acc, key) => {
  acc[x[key]] = y[key]
  return acc
},{})

console.log(z)

Upvotes: 2

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