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29 lines
952 B
Markdown
29 lines
952 B
Markdown
# Pipeline Operator
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The pipeline operator is used like this:
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``` erg
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assert f(g(x)) == (x |> g |> f)
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assert f(g(x, y)) == ((x, y) |> g |> f)
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```
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In other words, the order `Callable(object)` can be changed to `object |> Callable`.
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Pipeline operators can also be used on methods. For methods, `object.method(args)` changes to `object |>.method(args)`.
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It looks like just an increase in `|>`, but since the bond strength is low, the amount of `()` may be reduced.
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``` erg
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rand = -1.0..1.0 |>.sample!()
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log rand # 0.2597...
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1+1*2 |>.times do log("a", end: "") # aaa
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# without `|>`, the following will be `evens = (1..100).iter().filter(i -> i % 2 == 0).collect(Array)`
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evens = 1..100 |>.iter |>.filter i -> i % 2 == 0 |>.collect Array
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# or
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_evens = 1..100\
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.iter() \
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.filter i -> i % 2 == 0 \
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.collect Array
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```
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<p align='center'>
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<a href='./30_error_handling.md'>Previous</a> | <a href='./32_integration_with_Python.md'>Next</a>
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</p>
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