how to save an array in an object at runtime in javascript

Question

I want to save an array in an object in runtime through a loop.

For example, I take an input in an array inp=[2, 7, 20, 15, 19] and I want to save it in an obj={0:2, 1:7, 2:20, 3:15, 4:19}. But, at runtime such that I have a

    for(i=0;i<inp.length;i++) 
    { save each element of array into the respective object element }

The problem is that I have to save arrays of different lengths, these array come from taking an input from user.

I am also sorting the object afterwards and returning the indices in another array in my code. I am stuck only at how to save an array in an object during runtime. I searched a lot for a clue to get started but, I could not find anything.

An Array already is an Object.

user1106925
– user1106925

2012-04-15 02:12:25 +00:00
Commented Apr 15, 2012 at 2:12 — user1106925
– user1106925, Commented Apr 15, 2012 at 2:12

Community · Accepted Answer · 2017-05-23 11:49:03Z

1

Autoassign: (credit: am not i am)
```
var obj = inp.slice();
```

Manual Assignment:

var obj = {};
for(var i=0, n=inp.length; i<n; i++) 
   obj[i]=inp[i];

Though an Array is technically a subclass of an Object in JavaScript, the only thing that is really happening in going from an Array to an Object, is that you're losing the native methods (indexOf,concat,reverse,etc) that are created during the array's construction.

edited May 23, 2017 at 11:49

CommunityBot

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answered Apr 15, 2012 at 2:16

vol7ron

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2 Comments

user1106925 Over a year ago

If you're going to copy it, you might as well do it the fast way var obj = inp.slice();

vol7ron Over a year ago

No problem, welcome to SO. If you found Derek or my answer helpful, give it an up vote and check off one of the answers that you found best answered your question. Upvotes/Checks are at no cost to your rating, in many cases, it helps increase your rating.

Derek 朕會功夫 · Accepted Answer · 2012-04-15 02:14:13Z

1

Array is already an object

If you do some experiments, you would find out:

typeof([]) //<--retruns "object"

answered Apr 15, 2012 at 2:14

Derek 朕會功夫

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