Menene enums kuma yaushe ya kamata ka yi amfani dasu?

Question

IT Interview Practice · Accepted Answer

**enum** yana bayyana jerin suna abubuwan da aka tsaita. TypeScript yana da enums na adadi da kuma string enums.

```ts
enum Direction { Up, Down, Left, Right } // numeric: Up=0, Down=1, ...
Direction.Up;        // 0
Direction[0];        // "Up" — numeric enums have a reverse mapping

enum Status {        // string enum — more readable values
  Active = "ACTIVE",
  Inactive = "INACTIVE",
}
Status.Active;       // "ACTIVE"
```

## Babbar gida: enums suna samar da code runtime

Ba kamar sauran nau'ikan TypeScript (wadanda suke bata a lokacin tatara), regular `enum` yana aika da JavaScript wuya a cikin cubukin ku. Wannan shine dalilin da marubuta kasuwar suke fifitawa **hadihin kamu string" in-the-way da `as const`, wadanda suke abin gaske gwaji-tsari:

```ts
// often preferred — zero runtime cost, easy to read in logs
const Status = { Active: "ACTIVE", Inactive: "INACTIVE" } as const;
type Status = typeof Status[keyof typeof Status]; // "ACTIVE" | "INACTIVE"

// or simply:
type Direction = "up" | "down" | "left" | "right";
```

## const enum

```ts
const enum E { A, B } // inlined at compile time — no runtime object, but has tooling caveats
```

## Menene mahimmancin hakan

Enums suna ba da suna masu mahimmanci ga tsarin da aka tsaita (jihotai, wurarai, jihotai) kuma suna tara su a karkashin jerin suna guda.

Ama domin suna samar da code runtime kuma suna da abubuwan da ba a sani ba (adadi enums an duba su tufa), TypeScript na zamani sai dai **hadihin suna string" don sauran lokuta — suna narke kuma suna samar da allushe cikin jiya.

Yi amfani da enums lokacin da kake so sanin jerin suna ko maimaitawa wajiya.

Babbar gida: enums suna samar da code runtime

const enum

Menene mahimmancin hakan

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