1.1 motivation

If I were to pick a language to use today
other than Java, it would be Scala.

James Gosling

Scala, it must be stated, is the current heir
apparent to the Java throne. No other language
on the JVM seems as capable of being a
"replacement for Java" as Scala, and the
momentum behind Scala is now unquestionable.

Charlies Olivier Nutter - JRuby lead

Though my tip though for the long term
replacement of javac is Scala. I'm very
impressed with it! I can honestly say if
someone had shown me the Programming
in Scala book by by Martin Odersky, Lex
Spoon & Bill Venners back in 2003 I'd
probably have never created Groovy.

James Strachen

public class Person {
private int age;
private String name;

public Person(int age, String name) {
this.age = age;
this.name = name;
}

public int getAge() {
return this.age;
}

public void setAge(int age) {
this.age = age;
}

public String getName() {
return this.name;
}

public void setName(String name) {
this.name = name;
}
}

class Person(var age: Int, var name: String)

List<Person> persons = ...
List<Person> adults = new LinkedList<Person>();
List<Person> kids = new LinkedList<Person>();
for (Person person : persons) {
if (person.getAge() < 18) {
kids.add(person);
} else {
adults.add(person);
}
}

val (kids, adults) = persons.partition(_.age < 18)

String s = "!em esreveR";
System.out.println(s.reverse());

val s: java.lang.String = "!em esreveR"
println(s.reverse)

=> Reverse me!

BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader("f.txt"));
System.out.println(reader.readLine());
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// Exception on close, ignore
}
}
}

using(new BufferedReader(new FileReader("f.txt"))) {
reader => println(reader.readLine())
}

I will never forget these words: "With great power
comes great responsibility." This is my gift, my
curse. Who am I? I'm Spider-man.

val myList = List(1, 2, 3)
val res = (10/:myList)(_+_)

??

Scala
Object oriented and functional
Statically typed
Java compatible
Complies to Java bytecode (and CLR)
Existing libraries/frameworks
Better Java

Todays schedule
Basic syntax
REPL, IDEs and setup
First class functions
Pattern matching
OO and traits
Functional programming
++

1.1 motivation

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