How to add object name into array javascript

Question

I want to ask simple question, how to add object name using javascript

I have try this

const data = ["1", "5", "3", "4"]
const obj = this.Tags.reduce((acc,e) => { acc[e] = e; return acc; }, {});

but the output, I need to change number with string name

{
  1: "1",
  3: "3",
  4: "4",
  5: "5"
}

I want the output to be like this, how to do that in javascript ?

{
  value: "1",
  value: "3",
  value: "4",
  value: "5"
}

Thanks

do you want json as an output? if then, you can't have duplicate keys — wangdev87, Nov 08 '20 at 10:51
You ask it "in JavaScript" - does that mean you have it for another language (perhaps Python? just an impression)? If that's the case, consider showing what you are trying to convert. — tevemadar, Nov 08 '20 at 10:53
Ok, it was just an impression that you were trying to convert an existing code from another language. Why do you want the output in that particular, nonexisting format? The closest thing that actually exists would look like `[{value:"1"},{value:"2"},...]` — tevemadar, Nov 08 '20 at 10:58
objects can't have the same key twice or more, I'm wondering how you would use this object — Ali Faris, Nov 08 '20 at 11:21
That's a very confusing question, if you wanted it as a string — lacrit, Nov 08 '20 at 11:31

score 1 · Accepted Answer · answered Nov 08 '20 at 11:05

1

I can assume you want this:

let _ = '';
const data = ["1", "5", "3", "4"];
const obj = JSON.stringify(data.sort().reduce((acc, e) => {
    _ += '_';
    acc[`${_}value`] = e;
    return acc;
}, {}), null, 2).replace(/_/g, '');
console.log(obj);

answered Nov 08 '20 at 11:05

@sinzo so you wanted a string? – epascarello Nov 08 '20 at 11:22

score 1 · Answer 2 · answered Nov 08 '20 at 11:19

The output you want would just be one entry because you can not have dupliceate keys

{
  value: "5"
}

I assume you actually want an array of objects,

const data = ["1", "5", "3", "4"];
const result = data.map(value => ({ value }));
console.log(result);

lacrit · Answer 3 · 2020-11-08T11:10:36.830

Well, in short, you can't have duplicate keys in an object, so can't have exactly the output you mentioned (here is another thread you can read about it). Here is an example how you can dynamically insert a key/value pair. Just change value${i} to whatever you need your key name to be.

const data = ["1", "5", "3", "4"]
const obj = data.reduce((acc,e,i) => { 
  acc[`value${i}`] = e; 
  return acc; 
}, {});

console.log(obj)

If this is necessary that all of the keys are named value I'd suggest using an array of objects instead (it is also mentioned in the thread I linked).

How to add object name into array javascript

3 Answers3