Start functional programming in Scala book

build.sbt

@@ -0,0 +1,5 @@
+name := "functional-programming-scala"
+
+version := "0.1"
+
+scalaVersion := "2.12.7"

src/main/scala/myModule.scala

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+object myModule {
+  def abs(n: Int): Int =
+    if (n < 0) -n else n
+
+  def factorial(n: Int): Int = {
+
+  def fact(n: Int, acc: Int) : Int = {
+    if(n == 1) acc
+    else fact(n - 1, acc * n)
+  }
+
+    fact(n, 1)
+  }
+
+  def fibonacci(n: Int) : Int = {
+    def go(n:Int, prev:Int, curr: Int): Int = {
+      if(n == 0) prev
+      else
+        go(n-1, curr, prev + curr )
+    }
+
+    go(n, 0, 1)
+  }
+
+  private def formatAbs(x: Int) ={
+    val msg = "The absolute value of %d is %d"
+    msg.format(x, abs(x))
+  }
+
+  def main(args: Array[String]): Unit ={
+    println(formatAbs(-42))
+  }
+}