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Scala & Functional Programming for Beginners | Rock the JVM

scala-rock-the-jvm

Scala: Identifiers

Identifiers are used to identify class names, method named, variable names, and object names. There are six kinds of identifiers in Scala:

• GRG (class)
• a (variable name)
• main (method name)
• Main (object name)
• ob (object name)
• and args (variable name)

Functional Programming Rules

DO NOT USE LOOPS

Note: Scala does have loops, however only use if there is no other way around solving your paradigm

Example Loop in Scala

 def doNotUseLoops(a: String, b: Int) = {
    var i = 0
    while (i < b) {
      println(a + " : " + i)
      i += 1
    }
  }

Alternitive to using a loop

  // This is an example of a Recursive Function 🤪
  def aRepeatedFunction(aString: String, n: Int): String = {
    if (n == 1) aString
    else aString + " : " + aRepeatedFunction(aString, n-1) 
  }

Functional Programming Notes:

• In Imperative languages like (Java, c++) you are executing a set of instructions (Do this, then that, then this).
• In functional programming you execute expressions, Think "It gives me the value of something"

Scala Links

• Note: Amanda Fawcett done a great job on this article Scala 101: a beginner's guide to the scalable language