Convert an array of ojects to an object

Question

What I wanted to achieved is convert an array of object into an object.

mycode

 var arr = data.questions
        var obj = {};
        for (let i = 0; i < arr.length; i++) {
            obj[arr[i].key] = arr[i].value;
        }
        console.log(obj)

result

data 
(2) [{…}, {…}]
0: {id: 48, questionaire: 94, question: "Helloworld", input_answer: null, order: 0, …}
1: {id: 49, questionaire: 94, question: "sadasdas", input_answer: null, order: 1, …}
length: 2
__proto__: Array(0)

want to achieve

questions {id: 11, questionaire: 16, question: "what?", input_answer: null, order: 0, …}

Expecting each of the object to have same set of keys. In that case you cannot convert it to `object` since an object cannot have duplicate key — brk, Feb 18 '19 at 07:21
What will be unique in your case? As object should have unique key — Pardeep Jain, Feb 18 '19 at 07:22
Possible duplicate of [Convert Array to Object](https://stackoverflow.com/questions/4215737/convert-array-to-object) — , Feb 20 '19 at 13:17

random · Accepted Answer · 2019-02-18T08:40:05.390

1

const input = [
    {id: 48, questionaire: 94, question: "Helloworld", input_answer: null, order: 0},
    {id: 49, questionaire: 94, question: "sadasdas", input_answer: null, order: 1}
];

const output = input.reduce((a, obj)=>{
    a[obj.id] = obj;
    return a;
}, {});

console.log(output);
// Or you can access the specific objects using there keys
console.log(output[48]);
console.log(output[49]);

If there is only one object in the array, then you can simply access the object using index.

var array = [{id: 44, questionaire: 90, question: "asd", input_answer: null, order: 0}];

console.log(array[0]);

edited Feb 18 '19 at 08:40

answered Feb 18 '19 at 07:38

random

7,756
3
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@how about there are multiple objects in an array? – Feb 18 '19 at 08:09
@JanMichaelDough - provide input and output you want. – random Feb 18 '19 at 08:20
data (2) [{…}, {…}] 0: {id: 48, questionaire: 94, question: "Helloworld", input_answer: null, order: 0, …} 1: {id: 49, questionaire: 94, question: "sadasdas", input_answer: null, order: 1, …} length: 2 __proto__: Array(0) – Feb 18 '19 at 08:24
Where is the output? – random Feb 18 '19 at 08:27
here is that catch i want to seperate it as two objects – Feb 18 '19 at 08:30
@JanMichaelDough - I am not really sure how you want actual result, I have updated my code, where I had created a single object with id as key and assigned the whole object to it and later you can access the specific objects using there id's. – random Feb 18 '19 at 08:37

score 0 · Answer 2 · answered Feb 18 '19 at 07:30

0

You can use Object.assign()

var a = [{
  a: 1
}, {
  b: 2
}, {
  c: 3
}]
var obj = {};
a.forEach(e => {
  Object.assign(obj, e)
})
console.log(obj)

answered Feb 18 '19 at 07:30

ellipsis

12,049
2
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33

It is working here. Don't know what is not working for you. If you care to elaborate? – ellipsis Feb 18 '19 at 10:43

Convert an array of ojects to an object

mycode

result

want to achieve

2 Answers2