Scala elegant and exotic part 1

Dec 19, 20120 likes451 views

Scala provides a more concise and flexible syntax compared to Java. It includes pre-built libraries that make programming easier. Scala supports native XML processing and allows parsing real-world data. An example shows how a simple "Hello World" program requires less code and boilerplate in Scala versus Java due to features like not needing a main method or importing output streams. Scala also provides more functional capabilities than Java like mapping lists to extract subsets in a simpler way using functions like flatMap. Classes can also be extended from functions, showing Scala's flexibility in mixing object-oriented and functional paradigms.

Scala- Elegant and Exotic! Part 1

By VulcanMinds

Scala – Elegant & Exotic!

• Scala’s elegant and exotic aspects
– Concise and flexible syntax
– Do more with less boilerplate
– Pre-built libs that are programmer friendly
– Real-world data parsing with native XML
support

$The Almighty “Hello Scala” Java Scala class HelloJava { (In REPL) Public static void main(String[] s) { Object HelloScala extends Application { System.out.println(“Hello Java!”) ; Console.println(“Hello Scala!”) } } } scala> HelloScala # javac HelloJava Hello Scala! # java HelloJava scala>_ Hello Java #_ Java : create a class , write the entry point - main method , access the console output stream through System class and use the println to print the string. Scala: extend the pre-defined ‘Application’ object and use the pre-defined ‘Console’ object to print to console.$

Of Party/Guests/Children Lists/Tuples/Maps
>val guests= List(("Manish", 30),("Andy" , 25),("Donald", 50),("Rita", 10),("Bob", 12),("Tiara", 5),("Chris", 67))

> val children = guests.flatMap(aGuest => if(aGuest._2 < 18) Some(aGuest._1) else None)
children: List[java.lang.String] = List(Rita, Bob, Tiara)

>val adults = guests.flatMap(aGuest => if(aGuest._2 >= 18) Some(aGuest._1) else None)
adults: List[java.lang.String] = List(Manish, Andy, Donald, Chris)

Now try to do this in Java… how many lines of code and checks for equality and null?

Scala Exotic OOAP or weird?
You thought …your concepts about classes, functions inheritance
were immutable huh?

scala> abstract class exotic extends (Int=> String)
defined class exotic
scala> class concrete extends exotic {
| def apply(in:Int) = {Console.println("Ok did the implementation");"Ok got it"}
|}
defined class concrete

scala> val exoticStuff = new concrete
exoticStuff: concrete = <function1>

scala> val result = exoticStuff(1000)
Ok did the implementation
result: java.lang.String = Ok got it

Some scala sanity: The exotic class extended an abstract function that took in an integer
and returned a string and the concrete class defined the function! So function seems == a
class how come?

Giving Some[Any] Option or None…. after Marriage!

scala> class Me(name:String,married:Boolean) {
| def canWatchMovie = {
| if (!married) {Console.println("you can anytime! dear"); Some(true)} else {
Console.println(“wife:How dare you without me"); None} }
|}
defined class Me

scala> new Me("manish",true).canWatchMovie
wife:How dare you without me
res41: Option[Boolean] = None

scala> new Me("manish",false).canWatchMovie
you can anytime! dear
res42: Option[Boolean] = Some(true)

Some scala sanity: Option is a ‘boxed’ class that can hold *Some*Any++ or ‘None’ objects. So
None looks like a ‘void’ for Java old timers like me… but wait… what is a Unit?

KSUG ScalaJS: Yet another what… ? It’s tempting to write your whole web application in one and only programming language, especially when this is yours language-of-choice. That’s the reason why Node.js got so much traction in the last years - JavaScript is the part of the web stack which will stay there, whether we like it or not. In the world of languages compiled/transpiled to it, there is ScalaJS that is trying to keep its head above water and gain some popularity. Let’s take a look and try to evaluate if it’s worth our time to try it.

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Scala elegant and exotic part 1

1. Scala- Elegant and Exotic! Part 1 By VulcanMinds

2. Scala – Elegant & Exotic! • Scala’s elegant and exotic aspects – Concise and flexible syntax – Do more with less boilerplate – Pre-built libs that are programmer friendly – Real-world data parsing with native XML support

3. The Almighty “Hello Scala” Java Scala class HelloJava { (In REPL) Public static void main(String[] s) { Object HelloScala extends Application { System.out.println(“Hello Java!”) ; Console.println(“Hello Scala!”) } } } scala> HelloScala # javac HelloJava Hello Scala! # java HelloJava scala>_ Hello Java #_ Java : create a class , write the entry point - main method , access the console output stream through System class and use the println to print the string. Scala: extend the pre-defined ‘Application’ object and use the pre-defined ‘Console’ object to print to console.

4. Of Party/Guests/Children Lists/Tuples/Maps >val guests= List(("Manish", 30),("Andy" , 25),("Donald", 50),("Rita", 10),("Bob", 12),("Tiara", 5),("Chris", 67)) > val children = guests.flatMap(aGuest => if(aGuest._2 < 18) Some(aGuest._1) else None) children: List[java.lang.String] = List(Rita, Bob, Tiara) >val adults = guests.flatMap(aGuest => if(aGuest._2 >= 18) Some(aGuest._1) else None) adults: List[java.lang.String] = List(Manish, Andy, Donald, Chris) Now try to do this in Java… how many lines of code and checks for equality and null?

5. Scala Exotic OOAP or weird? You thought …your concepts about classes, functions inheritance were immutable huh? scala> abstract class exotic extends (Int=> String) defined class exotic scala> class concrete extends exotic { | def apply(in:Int) = {Console.println("Ok did the implementation");"Ok got it"} |} defined class concrete scala> val exoticStuff = new concrete exoticStuff: concrete = <function1> scala> val result = exoticStuff(1000) Ok did the implementation result: java.lang.String = Ok got it Some scala sanity: The exotic class extended an abstract function that took in an integer and returned a string and the concrete class defined the function! So function seems == a class how come?

6. Giving Some[Any] Option or None…. after Marriage! scala> class Me(name:String,married:Boolean) { | def canWatchMovie = { | if (!married) {Console.println("you can anytime! dear"); Some(true)} else { Console.println(“wife:How dare you without me"); None} } |} defined class Me scala> new Me("manish",true).canWatchMovie wife:How dare you without me res41: Option[Boolean] = None scala> new Me("manish",false).canWatchMovie you can anytime! dear res42: Option[Boolean] = Some(true) Some scala sanity: Option is a ‘boxed’ class that can hold *Some*Any++ or ‘None’ objects. So None looks like a ‘void’ for Java old timers like me… but wait… what is a Unit?

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