Scala - Command line arguments and user keyboard input (script, JVM compilation, SBT)
Video Chapters (table of content with clickable links into a specific part of the video)
00:00 Introduction about the video content
00:41 Prerequisites (you should have some programming skills in at least some language)
01:05 Command prompt (showing the Scala, SBT and Java versions, creates new directory, starts Visual Studio Code)
02:01 Creates a Scala 3 file with a "Hello World" program
02:45 Executes "Hello World" as a script (without compiling to a .class fil) from the command prompt
03:20 Shows that the Scala 3 program does not work with Scala 2
03:29 Modifies the program to make it work also for Scala 2
05:04 Executes the modified program with Scala 3
05:20 Executes the modified program with Scala 2
05:57 Compiles the program with "scalac" i.e. generates .class files
06:56 Executes the compiled program with "scala"
10:45 Executes the compiled program with "java" runtime and classpath -cp
11:00 Replaces the implementation with code receiving arguments from the command line and the keyboard
13:50 Compiles and executes the program which receives arguments from the command line and the keyboard
14:20 Generates a new SBT project
15:15 Copies the program source code into a file in the generated SBT project
15:40 Executes the program with SBT
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Playlists for "Program arguments from command line and keyboard input" for different programming languages:
Playlist for the videos with english voice and english subtitles:
• Program arguments from command line and ke...
Playlist for the videos with swedish voice and swedish subtitles:
• Program argument från kommandoraden och in...
Scala playlist (english):
• Scala - Command line arguments and user ke...
Scala playlist (swedish):
• Scala - Program argument från kommandorade...
Scala
https://www.scala-lang.org
sbt
https://www.scala-sbt.org
Visual Studio Code (cross-platform editor):
https://code.visualstudio.com/download
Scala documentation relevant for the content of this video:
Scala 3 main function with @main annotation
https://docs.scala-lang.org/scala3/bo...
Scala 2 (and Scala 3) object with main method and Array[String] arguments
https://docs.scala-lang.org/scala3/bo...
'for loops'
https://docs.scala-lang.org/overviews...
Method 'println'
https://www.scala-lang.org/api/3.1.0/...
String interpolation
https://docs.scala-lang.org/overviews...
Command-Line I/O , Reading input
https://docs.scala-lang.org/overviews...
Method 'scala.io.StdIn.readLine'
https://www.scala-lang.org/api/3.1.0/...
Singleton object, Companion object, Static forwarding (instead of Java static methods)
https://docs.scala-lang.org/tour/sing...
Singleton design pattern
https://en.wikipedia.org/wiki/Singlet...
'scalac' compiler and 'scala' runner
https://docs.scala-lang.org/overviews...
SCALA_HOME environment variable (mentioned in the video at the time 7:30 - 9:30)
https://www.scala-lang.org/download/i...
sbt batch mode commands and arguments enclosed within quotes
https://www.scala-sbt.org/1.x/docs/Ru...