Destructuring ni nini na nini kinachoweza kufanya?

Question

IT Interview Practice · Accepted Answer

**Destructuring** inabandua maadili kutoka kwa safu au sifa kutoka kwa vitu hadi vigezo tofauti katika kauli moja, inayoweza kusomeka.

```js
// array destructuring (by position)
const [first, second] = [10, 20];      // first=10, second=20
const [a, , c] = [1, 2, 3];            // skip the middle → a=1, c=3

// object destructuring (by name)
const { name, age } = user;
const { name: userName } = user;        // rename → userName
const { city = "Unknown" } = address;   // default if missing
```

## Mifumo yenye nguvu

```js
// nested
const { address: { city } } = user;

// rest — grab the leftovers
const { id, ...rest } = obj;

// function parameters with defaults (very common)
function createUser({ name, role = "user" } = {}) { ... }

// swap variables without a temp
[x, y] = [y, x];
```

## Mahali unapoiona kila wakati

```js
// React
const [count, setCount] = useState(0);
function Card({ title, children }) { ... }

// imports, API responses
const { data, error } = await api.get("/users");
```

## Kwa nini ni muhimu

Destructuring inaondoa boilerplate (`const name = user.name; const age = user.age;` inakuwa mstari mmoja), inafanya saini za kazi kujiandaa (unakiona hasa ni props gani zinazotumiwa), na ni idiomatiki katika JS ya kisasa, React, na Node.

Sifa za thamani-chaguo msingi na rest pia hufanya usimamizi wa data ya hiari/sehemu kuwa safi.

Mifumo yenye nguvu

Mahali unapoiona kila wakati

Kwa nini ni muhimu

Maswali yanayohusiana