Combine objects values into the single object

Question

I have two objects -

a = {0:"hai",1:"hello"}
b = {0:"what",1:"you"}

I want to get a resulting object on merge of the following format

c = {0:"hai",1:"hello",2:"what",3:"you"}

I tried different merge techniques, but fail to achieve this. What are the optimal ways of achieving the above?

I want the previous values to exist as well. None of the answers mentioned help . — Rakshith Jayakumar
– Rakshith Jayakumar, Commented Apr 24, 2020 at 12:12

Aplet123 · Accepted Answer · 2020-04-24 12:19:21Z

1

Here's a solution that essentially converts the objects to arrays then merges them together using Array.prototype.concat:

Object.assign([], {0:"hai",1:"hello"}).concat(Object.assign([], {0:"what",1:"you"}))

answered Apr 24, 2020 at 12:19

Aplet123

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3 Comments

Yevhen Horbunkov Over a year ago

Above returns the array, whereas OP has requested an object

Aplet123 Over a year ago

Arrays are just objects with more helper methods. If you really hate the helper methods then you can just throw in an Object.assign({}, stuff) where stuff is the code I posted above.

Yevhen Horbunkov Over a year ago

'...you can just' what I can do is whole lot better, however we're talking here about your solutions, which is, basically, a half of the answer

Community · Accepted Answer · 2020-06-20 09:12:55Z

Universal approach for arbitrary number of input objects

Considering you want to merge your objects (with overlapping keys) in the order of appearance, I may suggest the following (works for arbitrary number of input objects)

extract Object.values() of your source objects
combine those values into single output with Array.prototype.flatMap()

Following is a live-demo as a proof of a concept:

const a = {0:"hai",1:"hello"},
      b = {0:"what",1:"you"},
      
      mergeObjects = (...args) => ({...args.flatMap(Object.values)}),
      
      c = mergeObjects(a,b)
      
console.log(c)

.as-console-wrapper{min-height:100%;}

However, since you don't seem to be making use of object keys and plain array may be what's desired, you may go as simple as that:

const a = {0:"hai",1:"hello"},
      b = {0:"what",1:"you"},
      
      mergeObjects = (...args) => args.flatMap(Object.values),
      
      c = mergeObjects(a,b)
      
console.log(c)

.as-console-wrapper{min-height:100%;}

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