Menene bambanci tsakanin kwakwalwa da zurfin koɗi?

Question

Accepted Answer

Abubuwan jiya ana sanya su **ta hanya**, don haka `b = a` ba shi yin koɗi — duka biyu suna nuni zuwa jiya guda. Kwakwalwar **kwakwalwa** tana nuni kawai mataki na sama amma tana raba haɗi na cikakke; kwakwalwar **zurfin** tana nuni komai, mai zaman kanta.

```js
const original = { name: "Ann", address: { city: "NY" } };

// shallow copy: spread / Object.assign
const shallow = { ...original };
shallow.name = "Bob";            // ✅ independent (top-level primitive)
shallow.address.city = "LA";     // ⚠️ ALSO changes original.address.city — shared!

original.address.city; // "LA"  ← mutated through the shallow copy
```

Jiya ta cikakke `address` ita ce **haɗin gida guda** a cikin duka biyu, don haka gyara shi yana shafar duka biyu.

## Yin zurfin koɗi

```js
const deep = structuredClone(original); // modern, built-in, handles most types
deep.address.city = "Chicago";          // ✅ original is untouched
```

Wasu zaɓuguzuɓu da jajatcewar su:

```js
JSON.parse(JSON.stringify(obj)); // simple, but LOSES functions, Dates → strings, undefined
// lodash: _.cloneDeep(obj)       // robust, for complex cases
```

## Menene mahaɗi

Iya a kofa na "menene ya sa jiyin mi ya canja baba?" kuɗi, musamman a cikin React/Redux inda dole ba ka tahali jiyi.

Fada tana da kyau idan kuna canza filayen mataki na sama kawai, amma ga sabuntawa na cikakke dole ne ku nuni mataki na cikakke ma (`{ ...obj, address: { ...obj.address, city } }`) ko yi zurfin runi.