Scala - Session 1

session1.scala

// Base types

val a: Int = 10

// Functions
// first class citizens - can be passed as values.

def add(a: Int, b:Int): Int = {
  a + b
}

// last line returns automatically.
// block scoped.

def addCurried(a: Int)(b: Int): Int = {
  a + b
}

def add7(a: Int): Int = {
  val x: Int => Int = addCurried(7)

  val y = x(a)

  y
}

add7(10)
add7(10)
add7(10)
add7(10)

// Referencial transparency

// You could replace the function
// with the result of the function anywhere
// and it would work

val stringBuilder = new StringBuilder("hello")

val meow = stringBuilder.append("world")
val cat = stringBuilder.append("world")

// Classes

class firstClass(a: Int = 10, b: String = "meowmeow") {
  // define getters and setters to get anything
}

val christie = new firstClass()

// Trait
// Abstract (implementing in interface in Java)

// Case Classes mean you don't need to call the new keyword
// and you have a getter by default.