Anonymous user
Day of the week: Difference between revisions
→{{header|Scala}}
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[[Category:Scala Implementations]]
{{libheader|Scala}}
===JDK (discouraged) ===
<lang scala>import java.util.{ Calendar, GregorianCalendar }
import Calendar.{ DAY_OF_WEEK, DECEMBER, SUNDAY }
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object DayOfTheWeek extends App {
val years = 2008 to 2121
val yuletide =
// If you want a test: (optional)
assert(yuletide ==
Seq(2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061,
2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118))
println(yuletide.mkString(
s"${yuletide.
" including where Christmas is observed on Sunday:\n", ", ", "."))
}</lang>
===JDK >= 8 (recommended)===
====Naive programming====
<lang scala>import java.time.{ DayOfWeek, LocalDate }
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" including where Christmas is observed on Sunday:\n", ", ", "."))
}</lang>
====Idiomatic programming====
<lang scala>import java.time.{ DayOfWeek, LocalDate }
object
val years = 2008 to 2121
val yuletide =
years.filter(
// If you want a test: (optional)
assert(yuletide ==
Seq(2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061,
2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118))
println(yuletide.mkString(
s"${yuletide.
" including where Christmas is observed on Sunday:\n", ", ", "."))
}</lang>
====Tail recursion
<lang scala>import java.time.{ DayOfWeek, LocalDate }
import scala.annotation.tailrec
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if (anni == Nil) accu
else inner(anni.tail, accu ++
(if (LocalDate.of(anni.head, 12, 25).getDayOfWeek() == DayOfWeek.SUNDAY) List(anni.head)
}
inner(years.toList, Nil)
}
// If you want a test: (optional)
assert(yuletide ==
Seq(2011, 2016, 2022, 2033, 2039, 2044, 2050, 2061,
2067, 2072, 2078, 2089, 2095, 2101, 2107, 2112, 2118))
println(yuletide.mkString(
s"${yuletide.
" including where Christmas is observed on Sunday:\n", ", ", "."))
}</lang>
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