Mene ne jenereta da kalmar na yield?

Question

Accepted Answer

A **jenereta** shine aiki da ke samar da ƙimomi **jiya, guda ɗaya a lokaci**, ta amfani da kalmar `yield` maimakon `return`. Ita ce ta ƙididdige kowane ƙima akan buƙatun a maimakon gina duka sakamakon a ciki alaƙa — madaidaici ne don manyan jerin ko cikakke jerin.

## yield da return

```python
# a regular function builds the WHOLE list in memory
def get_squares(n):
    return [i ** 2 for i in range(n)]   # all n values created at once

# a generator yields values ONE AT A TIME, on demand
def gen_squares(n):
    for i in range(n):
        yield i ** 2                     # pause here, return one value, resume on next()

for sq in gen_squares(1_000_000):        # uses almost NO memory
    print(sq)
```

`yield` **tsaya** aikin, ya mayar da ƙima, kuma **ci gaba** daga wannan daidai lokacin akan waje na gida — adana ƙayyadaddun jiha tsakanin ƙimomi. Babu abin da aka ƙiddige sai aka buƙata.

## Amfanin alaƙa

```python
sum(i ** 2 for i in range(10_000_000))   # generator expression — constant memory
sum([i ** 2 for i in range(10_000_000)]) # list — builds a huge list first (wasteful)
```

Don manyan bayanai, jenereta ke ajiye alaƙa a kwatancewa; tuƙi na tuƙi ya haifi komai a gida.

## Cikakke jerin (ba zai yiwu tare da tuƙi)

```python
def count_up():
    n = 0
    while True:        # infinite — but lazy, so it's fine
        yield n
        n += 1

gen = count_up()
next(gen)   # 0
next(gen)   # 1  — only computes when asked
```

Domin ƙimomi ana samarwa akan buƙatun, jenereta iya wakilta *cikakke* rafi — kawai ka ɗaukar abin da kake buƙata.

## Yadda matakai suka aiki a ƙasa

```python
gen = gen_squares(3)
next(gen)   # 0  — runs until the first yield
next(gen)   # 1  — resumes, runs to the next yield
next(gen)   # 4
next(gen)   # StopIteration — generator exhausted
```

## Jerin jenereta

```python
(x ** 2 for x in range(10))   # like a list comprehension but lazy (parentheses)
```

## Me ya sa ya matuwa

Jenerata ƙayyade ne don **ajiyar alaƙa-tasiri** na sarri ko rafi data — karatun manyan fayiloli gida gida, aiki akan manyan dangi, bincike, ko cikakke jerin — inda gina cikakke tuƙi zai ɓaci alaƙa.
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