Make key value pair from two different array

Question

I'm using local storage to get an arrays of strings,

First value attrIds is as follows,

var attrIds = localStorage.getItem('attributeids');
attrIds = JSON.parse(attrIds);

Second value confOptions is as follows,

I want something like this,

144: "5595"
93: "5487"

I have tried creating a loop inside the loop and tried to set the key and value but it's not working. I have also tried to set the single JSON object as key and setting value as '' but couldn't move further with that.

Does anyone have any idea regarding this?

You want to map each value from the first array with every value of the second array from the same index? — Alexandru Corlan, Apr 19 '21 at 16:11
[There's no such thing as a "JSON Object"](http://benalman.com/news/2010/03/theres-no-such-thing-as-a-json/). `.getItem()` returns a string. `attrIds` and `confOptions` are both arrays of strings. — Andreas, Apr 19 '21 at 16:13

score 2 · Answer 1 · answered Apr 19 '21 at 16:17

2

Create a nested array and then use `Object.fromEntries()`.

const 
  a = ["144", "93"],
  b = ["5595", "5487"],
  c = Object.fromEntries(a.map((v, i) => [v, b[i]]));

console.log(c);

answered Apr 19 '21 at 16:17

Som Shekhar Mukherjee

4,701
1
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Vasi Maruseac · Answer 2 · 2021-04-19T16:22:20.967

1

Using a for loop, you could do something like:

var attrIds = localStorage.getItem('attributeids');
attrIds = JSON.parse(attrIds);
confOptions = ["5595", "5487"]
const object = {};

for(let i=0; i<attrIds.length;i++)
object[attrIds[i]] = confOptions[i]

edited Apr 19 '21 at 16:22

answered Apr 19 '21 at 16:12

Vasi Maruseac

66
1
1
8

please add a full solution with for loop, really appreciated – Mohit Rane Apr 19 '21 at 16:16

score 1 · Answer 3 · answered Apr 19 '21 at 16:14

You can accomplish this using a simple for loop, accessing the items from the arrays, and assigning properties to an empty object.

const keys = ['144', '93'];
const values = ['5595', '5487'];

const obj = {};
for (let i = 0; i < keys.length; i++) {
  obj[keys[i]] = values[i];
}

console.log(obj); // prints { 144: '5595', 93: '5487' }

Make key value pair from two different array

3 Answers3

Create a nested array and then use Object.fromEntries().

Create a nested array and then use `Object.fromEntries()`.