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Fix fs2-data-csv example #18

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Merged
merged 2 commits into from
Mar 18, 2023
Merged

Fix fs2-data-csv example #18

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090976f
Fix fs2-data example
zetashift Mar 14, 2023
564e5b3
Format doc comment
zetashift Mar 14, 2023
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43 changes: 18 additions & 25 deletions docs/examples.md
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Original file line number Diff line number Diff line change
Expand Up @@ -233,25 +233,22 @@ val input = Files[IO]

object CSVPrinter extends IOApp.Simple:

val run: IO[Unit] =
// Let's do an aggregation of all the values in the age column
val meanIO =
input
.foldMap(p => (p.age.getOrElse(0), 1))
.compile
.lastOrError
.map((sum, count) => sum / count)

/** First we'll do some logging for each row,
* and then calculate and print the mean age */
val run =
input
.evalTap(p =>
IO.println(
s"${p.firstName} is taking flight: ${p.flightNumber} to ${p.destination}"
)
)
.collect({ case Passenger(_, _, Right(age), _, _) => age })
.foldMap(age => (age, 1))
.compile
.drain >> meanIO.flatMap(mean =>
IO.println(s"The mean age of the passengers is $mean")
)
.lastOrError
.flatMap((sum, count) =>
IO.println(s"The mean age of the passengers is ${sum / count}")
)
```


Expand Down Expand Up @@ -313,26 +310,22 @@ object CSVPrinter extends IOApp.Simple {
.through(decodeUsingHeaders[Passenger]())


val run: IO[Unit] = {
// Let's do an aggregation of all the values in the age column
val meanIO =
input
.foldMap(p => (p.age.getOrElse(0), 1))
.compile
.lastOrError
.map({ case (sum, count) => sum / count})

/** First we'll do some logging for each row,
* and then calculate and print the mean age */
val run =
input
.evalTap(p =>
IO.println(
s"${p.firstName} is taking flight: ${p.flightNumber} to ${p.destination}"
)
)
.collect({ case Passenger(_, _, Right(age), _, _) => age })
.foldMap(age => (age, 1))
.compile
.drain >> meanIO.flatMap(mean =>
IO.println(s"The mean age of the passengers is $mean")
)
}
.lastOrError
.flatMap({ case (sum, count) =>
IO.println(s"The mean age of the passengers is ${sum / count}")
})
}
```
@:@
Expand Down