How to assign array values into object as key values in javascript

Question

I'm getting a request in the following form:

req = {
"id": ["1","2"],
"values": ["fruit", "vegies"]
}

I want to send response as the following:

res = {
"idMap": {
    "1": ["fruit", "veggies"],
    "2": ["fruit", "veggies"]
}
}

I tried using map function but values comes as [Array] and not as ["fruits", "veggies"]. I attach the code below:

const values = req.values
const id = req.id.map((ids) => {
    const idmap = {
        [ids]: values
    }
    return idmap;
});
req = {
    "idMap": id
}

help me with this guys. Thanks in advance..

should res have the same object reference of the arrays?

Nina Scholz
– Nina Scholz

2019-06-12 06:41:33 +00:00
Commented Jun 12, 2019 at 6:41 — Nina Scholz
– Nina Scholz, Commented Jun 12, 2019 at 6:41
Your code seems to be working in my console actually.

Gaurav Punjabi
– Gaurav Punjabi

2019-06-12 06:44:08 +00:00
Commented Jun 12, 2019 at 6:44 — Gaurav Punjabi
– Gaurav Punjabi, Commented Jun 12, 2019 at 6:44
Maybe you also need to JSON.stringify() in your console.log

Markus
– Markus

2019-06-12 06:59:47 +00:00
Commented Jun 12, 2019 at 6:59 — Markus
– Markus, Commented Jun 12, 2019 at 6:59

Jack Bashford · Accepted Answer · 2019-06-12 06:46:43Z

2

You should use reduce for making an object - map returns an array.

const req = {
  "id": ["1", "2"],
  "values": ["fruit", "vegies"]
};

const res = {
  idMap: req.id.reduce((a, c, i) => (a[c] = [...req.values], a), {})
};

console.log(res);

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

You could also loop through the array and assign properties of a result object:

const req = {
  "id": ["1", "2"],
  "values": ["fruit", "vegies"]
};

let res = {
  idMap: {}
};

let values = req.values;
req.id.forEach((id, index) => res.idMap[id] = [...values]);

console.log(res);

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

edited Jun 12, 2019 at 6:46

answered Jun 12, 2019 at 6:41

Jack Bashford

44.3k11 gold badges56 silver badges84 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

New_Coder Over a year ago

i want response as {"1": ["fruits","veggies"], "2": ["fruits","veggies"]}

Jack Bashford Over a year ago

Oh, I see - my bad @New_Coder.

Jack Bashford Over a year ago

Fixed @New_Coder - any better?

Nina Scholz · Accepted Answer · 2019-06-12 07:00:22Z

0

You could generate an object from the mapped entries with (upcoming) Object.fromEntries.

var req = { id: ["1", "2"], values: ["fruit", "vegies"] },
    res = { idMap: Object.fromEntries(req.id.map(k => [k, req.values])) };

console.log(res);

edited Jun 12, 2019 at 7:00

answered Jun 12, 2019 at 6:43

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Collectives™ on Stack Overflow

How to assign array values into object as key values in javascript

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related