# 管道運算符

[![badge](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Fgezf7g7pd5.execute-api.ap-northeast-1.amazonaws.com%2Fdefault%2Fsource_up_to_date%3Fowner%3Derg-lang%26repos%3Derg%26ref%3Dmain%26path%3Ddoc/EN/syntax/31_pipeline.md%26commit_hash%3D06f8edc9e2c0cee34f6396fd7c64ec834ffb5352)](https://gezf7g7pd5.execute-api.ap-northeast-1.amazonaws.com/default/source_up_to_date?owner=erg-lang&repos=erg&ref=main&path=doc/EN/syntax/31_pipeline.md&commit_hash=06f8edc9e2c0cee34f6396fd7c64ec834ffb5352)

管道運算符的使用方式如下：

```python
assert f(g(x)) == (x |> g |> f)
assert f(g(x, y)) == ((x, y) |> g |> f)
```

換句話說，`Callable(object)` 的順序可以更改為 `object |> Callable`。
管道運算符也可用于方法。 對于方法，`object.method(args)` 更改為 `object |>.method(args)`。
它看起來只是更多的`|>`，但由于粘合強度較低，您可以減少`()`的數量。

```python
rand = -1.0..1.0 |>.sample!()
log rand # 0.2597...

1+1*2 |>.times do log("a", end := "") # aaa

evens = 1..100 |>.iter |>.filter i -> i % 2 == 0 |>.collect Array
# 在沒有管道操作符的情況下實現，
_evens = (1..100).iter().filter(i -> i % 2 == 0).collect(Array)
# or
__evens = 1..100 \
    .iter() \
    .filter i -> i % 2 == 0 \
    .collect Array
```

<p align='center'>
    <a href='./30_error_handling.md'>上一頁</a> | <a href='./32_integration_with_Python.md'>下一頁</a>
</p>