It would look like

    result = range(1, 3).concat(range 4, 6).map((x) -> x * x).filter (x) -> x % 2 is 0

or

    result = range 1, 3
    result = result.concat range 4, 6
    result = result.map (x) -> x * x
    result = result.filter (x) -> x % 2 is 0