Menene aikin mahimmanci na jima'i?

Question

Accepted Answer

**Aikin mahimmanci na jima'i** shine aikin da ya yi aƙalla daya daga cikin: **ya karɓi aikin azaman argument**, ko **ya dawo da aikin**. Suna yiwuwa ne domin aiki suke *ƙiman ƙari na farko* a JS (kaka iya iyo su kamar ƙima duk da ɗaya).

## Karɓuwa aikin

```js
[1, 2, 3].map(n => n * 2);        // map takes a function
button.addEventListener("click", handler); // so does addEventListener
setTimeout(() => doThing(), 1000);
```

## Komawa da aikin (galibi ta hanyar amincewa)

```js
function multiplier(factor) {
  return n => n * factor;  // returns a function that remembers `factor`
}
const double = multiplier(2);
const triple = multiplier(3);
double(5); // 10
triple(5); // 15
```

Here `multiplier` ya gina aiki na musamman daga jiya daya - amincewa ya ɗauki `factor`.

## Misali na aiki: maɓuɗɗin buəatarwa

```js
function withLogging(fn) {
  return (...args) => {
    console.log(`calling with`, args);
    const result = fn(...args);
    console.log(`result`, result);
    return result;
  };
}
const loggedAdd = withLogging((a, b) => a + b);
```

## Me yasa ya dace

Aikina mahimmanci na jima'i suna iya sanya kaɗa **bayyananne da sake amfani**.

Suna gida ga hanyoyin array (`map`/`filter`/`reduce`), jinkirin abubuwa, middleware, ɓayyewa, currying, da React alura (HOCs, custom hooks).

Sai dai rubuta ilimin madauki iri ɗaya sau-sau, kuna jefa *hali** azaman aikin.