The program should be familiar to anyone who has some programming of experience. It has a main method which prints the string Hello, world! to your console. Next, to see how we defined the main function, we used the def main() strange syntax to define it. def is a Scala keyword to declare/define a method, and we will be covering more about methods and different ways of writing them in the next chapter. So, we have an Array[String] as an argument for this method, which is an array of strings that can be used for initial configurations of your program, and omit is valid. Then, we use the common println() method, which takes a string (or formatted one) and prints it to the console. A simple hello world has opened up many topics to learn; three in particular:

● Methods (covered in a later chapter)
● Objects and classes (covered in a later chapter)
● Type inference - the reason why Scala is a statically typed language - explained earlier