Scala Examples - Revision history

Hoppinglife: /* Pattern Matching on Seq */

2020-06-07T22:16:19Z

Pattern Matching on Seq

← Older revision		Revision as of 22:16, 7 June 2020
Line 33:		Line 33:

	</syntaxhighlight>		</syntaxhighlight>

			See [https://riptutorial.com/scala/example/3056/pattern-matching-on-a-seq#:~:text=In%20general%2C%20any%20form%20that,and%20can%20have%20unexpected%20results. here]

Hoppinglife: /* Pattern Matching on Seq */

2020-06-07T22:15:44Z

Pattern Matching on Seq

← Older revision		Revision as of 22:15, 7 June 2020
Line 32:		Line 32:
	}		}

	</~~synctaxhighlight~~>		</syntaxhighlight>

Hoppinglife: /* Pattern Matching on Seq */

2020-06-07T22:15:17Z

Pattern Matching on Seq

← Older revision		Revision as of 22:15, 7 June 2020
Line 1:		Line 1:
	== Pattern Matching on Seq ==		== Pattern Matching on Seq ==

	<~~pre class~~="~~hljs~~">		<syntaxhighlight lang="scala">

	def f(ints: Seq[Int]): String = ints match {		def f(ints: Seq[Int]): String = ints match {
	case Seq() =>		case Seq() =>
Line 30:		Line 31:
	"The seq didn't match any of the above, so it must be empty"		"The seq didn't match any of the above, so it must be empty"
	}		}
	</~~pre~~>
			</synctaxhighlight>

Hoppinglife: Created page with "== Pattern Matching on Seq ==

 def f(ints: Seq[Int]): String = ints match {   case Seq() =>       "The Seq is empty !"   case Seq(first) =>       s"The seq..."

2020-06-07T22:13:31Z

Created page with "== Pattern Matching on Seq == <pre class="hljs"> def f(ints: Seq[Int]): String = ints match { case Seq() => "The Seq is empty !" case Seq(first) => s"The seq..."

New page

== Pattern Matching on Seq ==

<pre class="hljs">
def f(ints: Seq[Int]): String = ints match {
case Seq() =>
"The Seq is empty !"
case Seq(first) =>
s"The seq has exactly one element : $first"
case Seq(first, second) =>
s"The seq has exactly two elements : $first, $second"
case s @ Seq(_, _, _) =>
s"s is a Seq of length three and looks like ${s}" // Note individual elements are not bound to their own names.
case s: Seq[Int] if s.length == 4 =>
s"s is a Seq of Ints of exactly length 4" // Again, individual elements are not bound to their own names.
case _ =>
"No match was found!"
}

def f(ints: Seq[Int]): String = ints match {
case Seq(first, second, tail @ _*) =>
s"The seq has at least two elements : $first, $second. The rest of the Seq is $tail"
case Seq(first, tail @ _*) =>
s"The seq has at least one element : $first. The rest of the Seq is $tail"
// alternative syntax
// here of course this one will never match since it checks
// for the same thing as the one above
case first +: tail =>
s"The seq has at least one element : $first. The rest of the Seq is $tail"
case _ =>
"The seq didn't match any of the above, so it must be empty"
}
</pre>