diff options
Diffstat (limited to 'scala.html.markdown')
| -rw-r--r-- | scala.html.markdown | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/scala.html.markdown b/scala.html.markdown index 13e8d9d8..e82c1c36 100644 --- a/scala.html.markdown +++ b/scala.html.markdown @@ -169,6 +169,12 @@ def sumOfSquaresShort(x: Int, y: Int): Int = x * x + y * y // Syntax for calling functions is familiar: sumOfSquares(3, 4) // => 25 +// You can use parameters names to specify them in different order +def subtract(x: Int, y: Int): Int = x - y + +subtract(10, 3) // => 7 +subtract(y=10, x=3) // => -7 + // In most cases (with recursive functions the most notable exception), function // return type can be omitted, and the same type inference we saw with variables // will work with function return values: @@ -322,9 +328,15 @@ divideInts(10, 3) // (Int, Int) = (3,1) val d = divideInts(10, 3) // (Int, Int) = (3,1) d._1 // Int = 3 - d._2 // Int = 1 +// Alternatively you can do multiple-variable assignment to tuple, which is more +// convenient and readable in many cases +val (div, mod) = divideInts(10, 3) + +div // Int = 3 +mod // Int = 1 + ///////////////////////////////////////////////// // 5. Object Oriented Programming @@ -455,6 +467,9 @@ def matchEverything(obj: Any): String = obj match { // You can nest patterns: case List(List((1, 2, "YAY"))) => "Got a list of list of tuple" + + // Match any case (default) if all previous haven't matched + case _ => "Got unknown object" } // In fact, you can pattern match any object with an "unapply" method. This @@ -607,6 +622,9 @@ import scala.collection.immutable.{List => ImmutableList} // Import all classes, except some. The following excludes Map and Set: import scala.collection.immutable.{Map => _, Set => _, _} +// Java classes can also be imported. Scala syntax can be used +import java.swing.{JFrame, JWindow} + // Your programs entry point is defined in an scala file using an object, with a // single method, main: object Application { |