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17 lines
362 B
Python
17 lines
362 B
Python
from permchain import Pregel, channels
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grow_value = (
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Pregel.subscribe_to("value")
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| (lambda x: x + x)
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| Pregel.write_to(value=lambda x: x if len(x) < 10 else None)
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)
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app = Pregel(
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chains={"grow_value": grow_value},
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channels={"value": channels.LastValue(str)},
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input="value",
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output="value",
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)
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assert app.invoke("a") == "aaaaaaaa"
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