How to assign multiple value to an enum in Typescript?

Question

How to assign multiple value to an enum in typescript ? my enum is:

export enum TaxabilityType {
  Yes = 'TAXABLE',
  No = 'NON_TAXABLE',
  Unknown = 'MAYBE'
}

But I do not need 'Unknown' and for the value 'MAYBE' I want 'No' so I need something like:

  export enum TaxabilityType {
      Yes = 'TAXABLE',
      No = 'NON_TAXABLE' || 'MAYBE'

    }

How can I achieve it ?

What do you want to use this for? Or better yet, how do you imagine you'd use this? — Cerbrus
– Cerbrus, Commented Aug 12, 2019 at 13:43
It can be done if the enum is used for flags but not for strings. You can see an example of combined flags in this article. — Martin Parenteau
– Martin Parenteau, Commented Aug 12, 2019 at 15:01

Cerbrus · Accepted Answer · 2019-08-12 13:42:53Z

8

You can't.

An enum is a "set of named constants." (source)

A constant can't be two values.

answered Aug 12, 2019 at 13:42

Cerbrus

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Jonas Wilms · Accepted Answer · 2019-08-12 13:52:03Z

5

If you have to parse that enum from a datasource that has three different values you could do:

 export enum TaxabilityType {
  Yes = 'TAXABLE',
  No = 'NON_TAXABLE',
}

function getTaxability(taxability: "TAXABLE" | "NON_TAXABLE" | "MAYBE"): TaxabilityType {
 if(taxability === "MAYBE") return TaxabilityType.No;
 return TaxabilityType[taxability];
}

answered Aug 12, 2019 at 13:52

Jonas Wilms

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