feat: implement head and headOption operators
#25
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rucek
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Oct 26, 2023
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rucek
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rucek
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Oct 26, 2023
The `headOption` operator returns the first element in `Source` wrapped
in `Some` or `None` in case when source is empty or failed e.g.:
Source.empty[Int].headOption() // None
Source.fromValues(1, 2).headOption() // Some(1)
The `head` operator returns the first element in `Source` or throws
`NoSuchElementException` in case when it is either empty or `receive()`
operation fails without error. In case when `receive()` fails with
exception then this exception is re-thrown e.g.:
Source.empty[Int].head() // throws NoSuchElementException("cannot obtain head from an empty source")
Source.fromValues(1, 2).head() // 1
Note that neither `head` nor `headOption` are idempotent operations.
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The
headOptionoperator returns the first element inSourcewrapped inSomeorNonein case when source is empty or failed e.g.:The
headoperator returns the first element inSourceor throwsNoSuchElementExceptionin case when it is either empty orreceive()operation fails without error. In case whenreceive()fails with exception then this exception is re-thrown e.g.: