Array of dictionaries to a single array of dictionary in javascript

Question

I have a javascript array as

arr = [{"class":"a"},{"sub_class":"b"},{"category":"c"},{"sub_category":"d"}]

I want a new array as:

new_arr = [{"class":"a", "sub_class":"b", "category":"c", "sub_category":"d"}]

Is it possible to do this in Javascript without using a for loop to iterate through arr?

Why is it still an array if you only have one element in it? — HMR
– HMR, Commented Jul 8, 2020 at 16:08
Because I might need to push new dictionaries to the array later — Crazzay1903
– Crazzay1903, Commented Jul 8, 2020 at 16:08

Rosh · Accepted Answer · 2020-07-08 16:31:12Z

6

You can use Object.assign:

const array = [{
  "class": "a"
}, {
  "sub_class": "b"
}, {
  "category": "c"
}, {
  "sub_category": "d"
}]

const mergedObject = Object.assign({}, ...array);

// And put in an Array if that was intentional
const newArray = [mergedObject];

console.log(newArray);

edited Jul 8, 2020 at 16:31

Rosh

8678 silver badges18 bronze badges

answered Jul 8, 2020 at 16:10

Jacob

79k24 gold badges159 silver badges245 bronze badges

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

Comments

Federico Alecci · Accepted Answer · 2020-07-08 16:11:23Z

1

I think that you want to merge objects. You could either use a spread operator or Object.assign. I don't see the point of having a single object inside an array. Considering your requirements you could do:

const merged = arr.reduce((list, curr) => {
   return Object.assign({}, list, curr);
}, {});

const newArr = [merged];

answered Jul 8, 2020 at 16:11

Federico Alecci

9146 silver badges14 bronze badges

Comments

Nonik · Accepted Answer · 2020-07-08 16:26:28Z

1

You can try this.

var arr = [{"class":"a"},{"sub_class":"b"},{"category":"c"},{"sub_category":"d"}];
var res=[];
var res1=[];
res=Object.assign(...arr);
res1.push(res);

console.log("Result: ",res1);

answered Jul 8, 2020 at 16:26

Nonik

6454 silver badges11 bronze badges

1 Comment

Jacob Over a year ago

Just be aware that this mutates the first object in arr, which you may or may not care about. Passing {} as the first element will make sure you're creating a new object and are assigning to that.

Collectives™ on Stack Overflow

Array of dictionaries to a single array of dictionary in javascript

3 Answers 3

Comments

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related