Extract javascript array value as Object key

Question

I have the following array with objects

objectArray = [{name: “E-mail”, data_type: “text”}, {name: “Number”, data_type: “text”}, {name: “Person”, data_type: “text”}]

I need to extract just the name prop from the array object as a key in a new object like this:

counterObject = {E-mail: 0, Number: 0, Person: 0}

I've tried to map the array like this

objectArray((elem) => {
                return {[elem.name]:0};
            }))

and I've got the following result:

[{Text: 0}, {Number: 0}, {E-mail: 0}, {Person: 0}, {Upload: 0}, {Date: 0}, {Link: 0}]

Smart-quotes in code make it harder for people to work with your code. — Dave Newton
– Dave Newton, Commented Apr 7, 2021 at 16:00
Does this answer your question? How do I convert array of Objects into one Object in JavaScript? — Heretic Monkey
– Heretic Monkey, Commented Apr 7, 2021 at 17:03

Dave Newton · Accepted Answer · 2023-02-11 18:12:58Z

1

const arr = [{ name: "E-mail" }, { name: "Number" }, { name: "Person" }];

const result = {};
arr.forEach(obj => result[obj.name] = 0);

console.log(result);

reduce is another solution, but IMO it's less readable, and has the disadvantage of continually creating/shallow-copying the accumulator.

edited Feb 11, 2023 at 18:12

answered Apr 7, 2021 at 16:44

Dave Newton

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Comments

blex · Accepted Answer · 2021-04-07 16:00:15Z

0

You can use reduce for this:

const objectArray = [{name: "E-mail", data_type: "text"}, {name: "Number", data_type: "text"}, {name: "Person", data_type: "text"}];

const result = objectArray.reduce((res, o) => ({ ...res, [o.name]: 0 }), {});

console.log(result);

answered Apr 7, 2021 at 16:00

blex

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1 Comment

Stanciu Patrick Over a year ago

It works, thank you! I didn't thinked about reduce

Me Bottle O Scrumpy · Accepted Answer · 2021-04-07 16:09:06Z

0

try this code

let extractedKeys = Object();

for(i = 0; i < objectArray.length ; i++){

     extractedKeys[objectArray[i]['name']] = 0;
}

console.log(extractedKeys);

answered Apr 7, 2021 at 16:09

Me Bottle O Scrumpy

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