feat: implement reduce operator
#30
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rucek
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Oct 30, 2023
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I fixed the title ;) |
adamw
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Oct 30, 2023
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rucek
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Uses the first and the following (if available) elements from this source
and applies function `f` on them. The returned value is used as the next
current value and `f` is applied again with the value received from a source.
The operation is repeated until the source is drained.
This is similar operation to `fold` but it uses the first source element as
`zero` e.g.:
Source.empty[Int].reduce(_ + _) // throws NoSuchElementException("cannot reduce an empty source")
Source.fromValues(1).reduce(_ + _) // 1
val s = Source.fromValues(1, 2)
s.reduce(_ + _) // 3
s.receive() // ChannelClosed.Done
Note that in case when function `f` thrown an exception the it is
propagated up to the caller.
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Uses the first and the following (if available) elements from this source and applies function
fon them. The returned value is used as the next current value andfis applied again with the value received from a source. The operation is repeated until the source is drained. This is similar operation tofoldbut it uses the first source element aszeroe.g.:Note that when function
ffails then exception is propagated up to the caller.