Print "Hello World!"

"Hello World!".print

Random number:

Random.newInt( 1, 10 )

Dot before line, brackets & priorities:

(3 + ( 5 + 4 * 7 ) / 2 - 1).print

Classic notation:

Print 3 + ( 5 + 4 * 7 ) / 2 - 1

Chaining of functions:

[ 6, 9, 2, 8 ].sort.reverse.implode( '-' ).print

Changing and filtering lists:

[ 9, 7, 3, 8 ].map( each * 2 ).filter( each >= 10 ).print

Read file:

File( "demo.txt" ).lines.each.trim.caseDown.left( 3 ).print

Embed shell command:

"test.txt".´cat´?.trim.print

Graphic Swing-Application:

main = Swing_Main
button = Swing_Button( "Click me!" )
main.add( button )
main.setSize( 400, 300 ).setTitle( "Hello world" ).run