Menene bambanci tsakanin sanarwa na aikin da bayyanar aikin?

Question

IT Interview Practice · Accepted Answer

**Sanarwa** shine bayanin aikin mai suna; **bayyanar** ke sanya aikin zuwa mai-canja. Bambancin da ake bukatar shine **hoisting**.

```js
// Declaration — fully hoisted, callable before its line
declared();             // ✅ works
function declared() { return "hi"; }

// Expression — only the variable binding is hoisted, not the function
expressed();            // ❌ TypeError: expressed is not a function
var expressed = function () { return "hi"; };
```

## Me yasa bambanci ke da

Sanarwar aikin sun kasance hoisted **tare da jikinsu**, don haka aikin daba-gaida yana nan kafin aiwatar da isa. Bayyanar aikin kawai kima ce da aka sanya zuwa mai-canja — a lokacin telefon da qasida, `expressed` har yanzu `undefined` ce (tare da `var`) ko a cikin TDZ (tare da `let`/`const`).

## Menene kawai a baje

```js
// expression — for callbacks, conditional definitions, arrow functions
const handler = () => doThing();
const fn = condition ? a : b;
arr.map(x => x * 2);

// declaration — clear, hoisted top-level functions
function calculateTotal(items) { ... }
```

Sanarwa suna karantawa kyau don aikin mai suna-suna a matakin gida kuma suna amfani da hoisting (zaka iya bayyana su bayan amfani da su). Bayyanar sune dole ne ga aiwatar da kibiya, callbacks, IIFEs, da sanya aikin ona. Aiwatar da kibiya koyaushe bayyanar ne.

Me yasa bambanci ke da

Menene kawai a baje

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