diff --git a/scala.html.markdown b/scala.html.markdown new file mode 100644 index 00000000..f087881a --- /dev/null +++ b/scala.html.markdown @@ -0,0 +1,53 @@ +/* + Set yourself up: + + 1) Download Scala - http://www.scala-lang.org/downloads + 2) unzip/untar in your favourite location and put the bin subdir on the path + 3) Start a scala REPL by typing scala. You should see the prompt: + + scala> + + This is the so called REPL. You can run commands in the REPL. Let do just that: +*/ + +println(10) // prints the integer 10 + +println("Boo!") // printlns the string Boo! + + +// Evaluating a command gives you the type and value of the result + +1 + 7 + +/* The above line results in: + + scala> 1 + 7 + res29: Int = 8 + + This means the result of evaluating 1 + 7 is an object of type Int with a value of 8 + + 1+7 will give you the same result +*/ + + +// Everything is an object, including a function type these in the repl: + +7 // results in res30: Int = 7 (res30 is just a generated var name for the result) + +// The next line gives you a function that takes an Int and returns it squared +(x:Int) => x * x + +// You can assign this function to an identifier, like this: +val sq = (x:Int) => x * x + +/* The above says this + + sq: Int => Int = + + Which means that this time we gave an explicit name to the value - sq is a function that take an Int and returns Int. + + sq can be executed as follows: +*/ + +sq(10) // Gives you this: res33: Int = 100. The result is the Int with a value 100 +