Com S 541 Lecture -*- Outline -*-

* Other Means of Combination in Scala

     based on: scala.epfl.ch

** Programs

   are objects with a main method

   def main(args: Array[String]): Unit = ...

** Packages and compilation units

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        PACKAGES (AS IN JAVA, C#)

Packages define:
  "a set of member classes,
            objects and
            packages"

packages:
   cannot be used as values
   can be imported (import p.q;)
   can be selected (p.T)
   can have hidden (private) elements

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      DIFFS FROM JAVA

Multiple packages in a compilation unit:

   package p.q { /* ... */ }
   package p.r { /* ... */ }

Imports ordered:

   later imports can names
       from earlier imports

More implicit imports (ordered):

    1. java.lang
    2. scala
    3. scala.Predef

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** Compound Data (skip)

   Both objects and instances of classes can contain multiple pieces
   of data

   They can also group multiple other entities (classes, traits,
   packages, etc.)

** Compound Actions (skip)

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         COMPOUND ACTIONS

Conditionals:

    if (E1) E2

    if (E3) E4 else E5

Loops:

    while (Test) Body

    do B2 while (T2)

    for (Enums) yield EV

    for (Enums2) Body3

Blocks:

    { S1 ... Sn }
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