javascript array into object with same key names

Question

I have an unusual problem to solve here. I have an array of Guids

[
 "c01f8237-72c8-4fa6-9c53-1915750385aa",
 "2c8a471b-c408-436c-81b1-3f3867d8ffb4",
 "27a44d46-12bd-4784-ceed-57ada31b0e33"
]

This array has to be transformed into:

   {
     id: "c01f8237-72c8-4fa6-9c53-1915750385aa",
     id: "2c8a471b-c408-436c-81b1-3f3867d8ffb4",
     id: "27a44d46-12bd-4784-ceed-57ada31b0e33"
   }

I know that shouldn't be done, but unfortunately cannot control the back end part. Any idea?

Thanks

I know that very well. But as I said in the question, unfortunately the back end that receives the object hasn't been built in a standard way and I cannot change it. — Mauro74
– Mauro74, Commented Apr 14, 2014 at 16:30
@Mauro74 what he means is that it is not possible in javascript. However, what exactly is your back end expecting? Backends expect serialization formats, not javascript. The above is not valid JSON, is not not expecting json? — George Mauer
– George Mauer, Commented Apr 14, 2014 at 16:33
So you don't want it transformed into an object, but rather serialized into a string in that form. Seems like a very simple task if that's the case. What's the problem? — cookie monster
– cookie monster, Commented Apr 14, 2014 at 16:34
It sounds like the back end is not really expecting "JSON", but is really just using something trivial like String.split() to build an array that it then loops over. If so, you're stuck using string concatenation to build the input. — Shawn C
– Shawn C, Commented Apr 14, 2014 at 16:36

Wayne · Accepted Answer · 2014-04-14 16:29:57Z

2

The whole point of a dictionary key is that it uniquely maps to some value. Your desired output attempts to duplicate a key and therefore is neither possible nor does it make sense.

If you're passing this to a backend (as you suggest), then of course you can manually build a string to pass over the wire that duplicates keys in the payload, but you won't be able to actually do it in JavaScript first. You'll have to manually build the string.

Also note that you can call this format whatever you want, but you can't call it JSON and you can't use JSON libraries to build it (because it's not JSON). If your API expects a custom format, then you need to write code to build that custom format.

answered Apr 14, 2014 at 16:29

Wayne

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2 Comments

Mauro74 Over a year ago

I know that very well. But as I said in the question, unfortunately the back end that receives the object hasn't been built in a standard way and I cannot change it.

Wayne Over a year ago

If you're passing this to a backend, then of course you can manually build a string to pass over the wire that duplicates keys in the JSON payload, but you won't be able to actually do it in JavaScript first.

George Mauer · Accepted Answer · 2014-04-14 16:37:00Z

2

If all you want is a string just do something like

var str = '{' + idArray.map(function(id) { 
       return "id: "+id
   }).join(',\n')+'}';

I have no idea what mime type you would put on that though since its not valid JSON.

answered Apr 14, 2014 at 16:37

George Mauer

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2 Comments

cookie monster Over a year ago

Or just: str = '{id:"' + idArray.join('", id:"') + '"}' Probably just text/plain MIME. And you're missing the quotes around the IDs in the result.

Ruan Mendes Over a year ago

This answers the question, as non-sensical as it may be

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