Menene bambancin tsakanin any da unknown?

Question

IT Interview Practice · Accepted Answer

Dukansu zasu iya riƙe da *kome* ƙima, amma suna banbanta a **kariya**. `any` yana bugi jajjewar nau'in; `unknown` yana kasance waje kuma yana buƙatar ka ƙirƙira kafin amfani.

```ts
let a: any = "hello";
a.foo.bar;        // ✅ compiles — no checking at all (may crash at runtime)
a();              // ✅ compiles — TypeScript trusts you blindly

let u: unknown = "hello";
u.toUpperCase();  // ❌ Error: object is of type 'unknown'
u();              // ❌ Error — must narrow first
```

## unknown yana buƙatar jajjewar kafin amfani

```ts
function handle(input: unknown) {
  if (typeof input === "string") {
    input.toUpperCase(); // ✅ inside the guard, TS knows it's a string
  }
}
```

`unknown` shine **matsayin kariya na `any`**: kana iya sanya abin da dama a gare shi, amma ba za ka iya yin abin da dama da shi ba sai kawai ka tabbatada abin da ake shan gida ta hanyar nau'i gadi.

## Lokacin da za a yi amfani da waɗansu

- **`unknown`** — don ƙimomin jigon nau'i ainihi a bakin kulli: sakamakon `JSON.parse`, amsa API, `catch (e: unknown)`. Yana buƙatar ka tabbatar da shi.
- **`any`** — dereva tafiya lokacin da you jiyya JavaScript ko da yaushe ba za ka iya taɓa abin da dama ba. Yi amfani da kariya; yana ɓaje-ɓajewa shiru kuma yana cusewa kariya.

## Me ya sa ya baka mahimma

Zuwa `any` yana karye burin TypeScript.

Gida `unknown` a bakin kulli mara nau'i — yana ajiye garanti na compiler habada har yanzu yana karbon shiryawa katsina, yana buƙatar ka tabbatar da bayani kafin gaskiya da shi.

unknown yana buƙatar jajjewar kafin amfani

Lokacin da za a yi amfani da waɗansu

Me ya sa ya baka mahimma

Tambayoyi masu alaƙa