The range function yields an iterable range over either Integer or Long bounds:

# Prints 1 2 (...) 100
foreach i in range(1, 101) {
  print(i + " ")
}

let r = range(0, 6): incrementBy(2)
println("Start: " + r: from())
println("End: " + r: to())
foreach i in r {
  println(i)
}

println("Increment: " + r: increment())

The lower bound is inclusive, the upper bound is exclusive.