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Scala for Java developers.mm
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<map version="0.8.1">
<!-- To view this file, download free mind mapping software FreeMind from http://freemind.sourceforge.net -->
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<text>:author: Vassil Dichev
:date: |date|</text>
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<text> .. image:: images/java2days.png
 :class: scale
 :height: 73
 :width: 259</text>
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<text>If I were to pick a language to use today other than Java, it would be Scala

-- James Gosling</text>
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<text>[...] if someone had shown me the Programming in Scala book [...] I'd probably have never created Groovy.

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<text>class Person {
 private String name;
 private int age;
 public Person(String name, int age) {
 this.name = name;
 this.age = age;
 }
 public void setName(String name) {
 this.name = name;
 }
 public String getName() { return name; }
 public void setAge(int age) {
 this.age = age;
 }
 public int getAge() { return age; }
}</text>
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 :align: center</text>
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<text>class Person(var name: String, var age: Int)</text>
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 :class: scale
 :width: 432
 :height: 284
 :align: center</text>
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<text>case class Person(name: String, age: Int)</text>
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<text>.. image:: images/Diamond_inheritance.png
 :class: scale
 :height: 300
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 :align: center</text>
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<text>trait ObjectOriented {
 override def toString =
 "object-oriented " + super.toString }
trait Functional {
 override def toString =
 "functional " + super.toString }
class ProgrammingLanguage {
 override def toString = "language" }
var scala = new ProgrammingLanguage
 with Functional with ObjectOriented
// object-oriented functional language
scala = new ProgrammingLanguage
 with ObjectOriented with Functional
// functional object-oriented language</text>
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<text>val list = List(1, 3)
val digitNames = Map(2 -> "two", 4 -> "four")

list(1)
digitNames(2)

list.apply(1)
digitNames.apply(2)</text>
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<text>myVar match {
 case s: String => "string: " + s
 case List(1, _*) => "list starting with 1"
 case Person("Martin Odersky", 53) => "Scala's father"
 case _ => 
}

val digitNames: Int => String = {
 case 2 => "two"
 case 4 => "four"
}</text>
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</node>
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<hook NAME="accessories/plugins/NodeNote.properties">
<text>1.to(5)
// Range(1, 2, 3, 4, 5)
1.to(5).filter{ i => i % 2 == 0 }
// Vector(2, 4)
1.to(5).filter{ _ % 2 == 0 }.map{digitNames}
// Vector(two, four)</text>
</hook>
</node>
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<icon BUILTIN="help"/>
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the universe and everything""")
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!!!

...</text>
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