✎ pp:scala-project [books]

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======= Scala @ PP =======



===== 1. Installation =====

===== 2. Syntax =====

2.1. Writing functions
2.2. Function evaluation (order of parameters in function call matters !)
     - using the ''=>'' to delay evaluation
2.3. Conditionals
     - '' def f(x : Int) = if (x >= 0) x else -x''
     - boolean expressions (''true'', ''false'', ''!b'', ''&&'', ''||'')
     - the "by value" definition using ''val''
     - example using def and val against a loop
    
     
Newton square root estimation

 * Blocks - expressions in Scala 
 * visibility of variables in blocks
 * local scoping (similar to let)
 * semicolons (optional)
 * tail recursion in Scala (only direct recursive calls are optimised @tailrec)
 * function types (''f : Int => Int'')
 * anonymous functions (''(x: Int, y: Int) => x + y'', '' x => x+x'')
 * currying (''def f(x: Int, y: Int)(z: Int):Int = x+y+z'')
 * higher-order functions (mapReduce implementation)

 * classes and **methods**
<code scala>
class Rational(x: Int, y: Int) { // creates a Type as well as a constructor for the new type
    def a = x
    def b = y
}

val r = new Rational(1,2)
</code>
  * ''toString'' and ''@override''