CODEWITHSUNDEEP
scala
Maximin
Maximin

Reputation: 1685

Scala code runs without compiling using scalac?

As per the Scala tutorials, we need to compile the Scala code using scalac filename.scala before executing it using scala filename. But when I tried like scala filename.scala, it runs and got the output.

Why is it so? So compiling using scalac is not required to run the code? Could someone please explain this.

Thanks.

scala -help was really helpful. It says

    A file argument will be run as a scala script unless it contains only
    self-contained compilation units (classes and objects) and exactly one
    runnable main method.  In that case the file will be compiled and the
    main method invoked.  This provides a bridge between scripts and standard
    scala source.

Thanks Dennis for the pointer.

Upvotes: 2

Views: 1122

Answers (2)

Dennis
Dennis

Reputation: 2665

This behavior is explained in the help for the scala command.

You can get the help by executing the scala -help command.

Upvotes: 2

egprentice
egprentice

Reputation: 824

running the scala command actually compiles it first behind the scenes, then runs the resulting program.

Upvotes: 5

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