How to get enum member index (not member name) in typescript?

Question

I have the following enum:

export enum Categoria {
    Acao = 1,
    Opcao = 2,
    FundoImobiliario = 3,
    ContratoFuturo = 4,
    ETF = 5,
    BDR = 6
}

I use the following code to return the enum members to the screen:

export function enumSelector(objeto: any) {
    return Object.keys(objeto).filter(key => !isNaN(Number(objeto[key])));
}

This enum populates an HTML select. So I select an option and do the post on my form, but what I get is the member name enum. How do I get the enum index? For example: 1 or 2 or 3 etc.

What exactly are you trying to do here? If you want a mapping from key to value of the enum, you could use the enum directly, possibly without the built-in reverse mapping, like this. But if that's all you want, you probably shouldn't use an enum anyway. What's wrong with just this using a const instead of an enum? — jcalz
– jcalz, Commented Aug 12, 2021 at 2:41

Bechir Anoir Chabchoub · Accepted Answer · 2021-08-12 00:52:36Z

1

This code may help you with the issue you are handling (keyof)

enum socialMedia {
Instagram = 1,
Facebook,
Whatsapp,
Snapchat
}
type KeyofEnum = keyof socialMedia;
function getsocialMedia(mediaOfficial: string): socialMedia {
if (mediaOfficial === 'Filters' || mediaOfficial === 'Snaps') {
return socialMedia.Snapchat;
}
}
let mediaType: socialMedia = getsocialMedia('Snaps'); // returns Snapchat
console.log('keyof enum string type Snapchat is', mediaType);

Output:

TypeScript keyof Enum 1

answered Aug 12, 2021 at 0:52

Bechir Anoir Chabchoub

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1 Comment

jcalz Over a year ago

I don't see how this addresses the question as asked. And keyof socialMedia is equivalent to "toString" | "toFixed" | "toExponential" | "toPrecision" | "valueOf" | "toLocaleString", which is unlikely to be anything anyone wants. Could you elaborate about what you are doing and how it is intended to apply as an answer?

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