From 3dbcf1c2c6092b0287bae150eec2271446f95927 Mon Sep 17 00:00:00 2001 From: Pavel Kazlou Date: Sat, 31 Oct 2015 16:22:59 +0300 Subject: added docs for multi-variable tuple assignment --- scala.html.markdown | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'scala.html.markdown') diff --git a/scala.html.markdown b/scala.html.markdown index 192e03d7..4ba9a31b 100644 --- a/scala.html.markdown +++ b/scala.html.markdown @@ -321,9 +321,15 @@ 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 -- cgit v1.2.3 From bc087b50370a3c32c35ef026047c2fa9db9944d8 Mon Sep 17 00:00:00 2001 From: Pavel Kazlou Date: Sat, 31 Oct 2015 16:39:47 +0300 Subject: usage of named parameters --- scala.html.markdown | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'scala.html.markdown') diff --git a/scala.html.markdown b/scala.html.markdown index 192e03d7..bc8cd422 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: -- cgit v1.2.3 From d47f06345b37cecf4072523c1c79f63f37846d8c Mon Sep 17 00:00:00 2001 From: Pavel Kazlou Date: Sat, 31 Oct 2015 16:50:40 +0300 Subject: added docs for default case in pattern matching --- scala.html.markdown | 3 +++ 1 file changed, 3 insertions(+) (limited to 'scala.html.markdown') diff --git a/scala.html.markdown b/scala.html.markdown index 192e03d7..131bd71c 100644 --- a/scala.html.markdown +++ b/scala.html.markdown @@ -454,6 +454,9 @@ 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 -- cgit v1.2.3