Convert a typescript enum into an array of enums

Question

I have an enum

export enum A{
   X = 'x',
   Y = 'y',
   Z = 'z'
}

I want this to be converted to

[A.X, A.Y, A.Z]

Type of the array is A[]. How to do this?

Look at https://stackoverflow.com/questions/43100718/typescript-enum-to-object-array — Sudhir Ojha, Sep 28 '18 at 11:26

score 13 · Accepted Answer · edited Sep 28 '18 at 11:38

13

You can use Object.keys to get the keys of the enum and use them to get all the values.

It would look something like this.

let arr: A[] = Object.keys(A).map(k => A[k])

You can see it working here.

edited Sep 28 '18 at 11:38

suku

answered Sep 28 '18 at 11:29

toskv

1

I want to retain the type as enum. I am editing your answer accordingly – suku Sep 28 '18 at 11:38
3

I believe you can use `Object.values(A)` as well, to avoid unnecessary mapping. Enum is compiled to just an object, thats why both `keys` and `values` methods work here. – Matt Leonowicz Oct 03 '19 at 09:33
6

`Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'typeof A'. No index signature with a parameter of type 'string' was found on type 'typeof A'.` – Piotr Siupa Aug 20 '20 at 08:33
`Element implicitly has an 'any' type because index expression is not of type 'number'.` – aurelia Aug 08 '22 at 19:49

score 4 · Answer 2 · answered Dec 29 '20 at 15:57

4

You can use Object.values to get value of enum

enum A {
  X = 'x',
  Y = 'y',
  Z = 'z'
}
let arr = Object.values(A)
console.log(arr);

answered Dec 29 '20 at 15:57

fdani

([Matt Leonowicz assumed so](https://stackoverflow.com/questions/52554208/convert-a-typescript-enum-into-an-array-of-enums#comment102808662_52554378)) – greybeard Dec 29 '20 at 16:15

2 Answers2