How can I use Array as Object key in javascript?

Question

I want to make a dictionary that able to get same result with different keys,
so I did something like this in javascript:

var dictionary = {
        [CHW,CW] : {                      //CHW and CW is ref to same thing
            [FLOW,FLW,FW] : 'Result 1'    //FLOW, FLW and FW is ref to same thing(Flow)
           }
        }

The code above only showing the concept, what I should do to get my expected output below?
expected output:

dictionary.CHW.FLW   //output: 'Result 1'
dictionary.CW.FLW    //output: 'Result 1'
dictionary.CW.FLOW   //output: 'Result 1'
dictionary.ABC.EFG   //output:  undefined

My ultimate goal is to able to get the same output by calling different keys in the dictionary. Is there any library/Logic that can do so? Thanks for helping me out!

If you want the same key to return the same result as another key, that is simply pointing the secondary key to the first keys value. var x = { a: 3 }; x.b = x.a; — Taplar
– Taplar, Commented Aug 19, 2020 at 17:10

mbojko · Accepted Answer · 2020-08-19 17:09:27Z

2

Plain object can't do that, a Map can:

The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as either a key or a value.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map

answered Aug 19, 2020 at 17:09

mbojko

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2 Comments

Taplar Over a year ago

Are you saying that if the user made a Map with a key of ["x", "y"]", that they could access in the map mapVar.x and mapVar.y, even though the key, in actuality, is an array and not those unique values?

Fred Over a year ago

thanks for helping, it really solved my problem, I can use map.get("example_key") to get what i want now

deepak · Accepted Answer · 2020-08-19 17:17:28Z

0

you can create computed property in the object. Here I am assuming you are storing key in variable.

var dictionary = {
        [CHW] : {
              [CW]: {
                      [FLOW] : 'Result 1'
                    }
                  }
              }

now you can access the way you want. dictionary[CHW][CW][FLLOW] give you 'Result 1'

edited Aug 19, 2020 at 17:17

answered Aug 19, 2020 at 17:12

deepak

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1 Comment

deepak Over a year ago

Updated the solution, I was assuming that keys are stored in variable.

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