How to get name of enum generic type in typescript(angular)?

Question

I have an enum on angular like

export enum Status{
    Pending = 1,
    Working = 2,
    Finish = 3
}

using

var name = GetName<Status>(Status);

and I have other method to get name of enum

export function GetName<T>(en: T): string{
    // I want to get name here to result 'Status'
}

Does this answer your question? [How to get names of enum entries?](https://stackoverflow.com/q/18111657/1260204) — Igor, Apr 01 '21 at 13:32
Variable containing object is generated for enum. So you're asking to get the name of variable which not possible (and probably won't be useful anyway because will be changed after minification) https://www.typescriptlang.org/play?#code/KYDwDg9gTgLgBMAdgVwLZwMowIY2QZwG8AoOMuABSQBMBLRAczgF44BGAGlPIHVoBrek1YAmLuTgAxerXwALFnADMxAL5A — Aleksey L., Apr 01 '21 at 13:41

Yeysides · Answer 1 · 2021-04-01T14:23:29.260

To my knowledge you can't do this with Enumerators, however, if you created a typed map object, you could assert it's type by looking for a unique property like so:

enum Status {
    Pending = 1,
    Working = 2,
    Finish = 3
}

interface StatusMap {
 pending: Status.Pending;
 working: Status.Working;
 finish: Status.Finish;
}

const obj: StatusMap = { pending: Status.Pending, working: Status.Working, finish: Status.Finish };

function checkIfStatus(obj: StatusMap): 'Status' | 'NotStatusOrSomething' { 
 if ('pending' in obj) { 
   return 'Status'
  } else {
    return 'NotStatusOrSomething'
  }
}

I already use enum mapping. I use other enum to map it. – Rath Socheat Apr 01 '21 at 16:06 — Rath Socheat, Apr 01 '21 at 16:06

score 0 · Answer 2 · answered Apr 01 '21 at 13:35

0

Technically, enum is an Object in typescript.

So function could be

export function getName<T>(enumObject: T, value: any): string {
  Object.keys(enumObject).find(key => {
    return enumObject[key] === value;
  });
}

answered Apr 01 '21 at 13:35

Liu Zhang

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I don't need like that it will return result like 'Pending' or 'Working' I want result is "Status" – Rath Socheat Apr 01 '21 at 13:38
@Viko - You want the type name, not the value? – Igor Apr 01 '21 at 13:40
@Igor yes I want type name. – Rath Socheat Apr 01 '21 at 13:40

How to get name of enum generic type in typescript(angular)?

2 Answers2