Yaya kake siyan abubuwa, sigiyoyi da nau'ikan dawowa?

Question

Accepted Answer

Kana ƙara nau'i bayan colon. TypeScript zai iya **yin karewa** nau'uka da yawa, don haka kana siyan inda ya ƙara clarity ko inda karewa ba shi yiwu ba.

```ts
// variables — usually let inference work
let count: number = 0;     // explicit
let name = "Ann";          // inferred as string (annotation redundant)

// function parameters — always annotate (can't be inferred)
function greet(name: string, times: number): string {
  return name.repeat(times);
}

// arrays and objects
const ids: number[] = [1, 2, 3];
const user: { name: string; age: number } = { name: "Ann", age: 30 };
```

## Nau'ikan dawowa: yin karewa ko siyan?

```ts
function add(a: number, b: number) { return a + b; } // inferred return: number
function load(): Promise<User> { ... }                // explicit — documents the contract
```

Nau'ikan dawowa an karewa su, amma siyan su akan aiki na kasua/jama'a shine kyakkyawan aiki: yana bayyana niyyar kuma yana kamata kurakura *a ciki* aiki (idan kana maida abubuwa mara kyau sosai, kurakura ta nuni ga aiki, ba ga wanda yake kira ta).

## Wasu lokuta

```ts
function log(msg: string): void {}     // returns nothing
function fail(): never { throw new Error(); } // never returns normally
const fn: (x: number) => string = ...; // function type annotation
```

## Me yasa ya kamata

Gida gida: **siyan siyan aiki (sigiyoyi da jama'ar dawowa nau'i) a fayyace, bar variables na gida an karewa.** Wannan yana ajiye code mai safi daidai makare a kasua na aiki a fahimta kuma ana bugi.