Looping
You can use map for looping:
(1..100).map{a->...a}
you can use it as well:
(1..100).map{...it}
If you want to loop a certain amount of times, use repeat
repeat(20){println("hi")}
String interpolation
You can use $ to interpolate values of variables into strings.
var s="World"
print("Hello, $s!") // Prints: Hello, World!
Use ${} to interpolate expression values.
var x=123
var y=456
print("$x+$y-12=${x+y-12}") // Prints: 123+456-12=567