Swift func operations

prefix func !<T>(f: (T)->Bool) -> (T)->Bool
{
    return { !f($0) }
}

func &&<T>(f1: (T)->Bool, f2: (T)->Bool) -> (T)->Bool
{
    return { f1($0) && f2($0) }
}

func ||<T>(f1: (T)->Bool, f2: (T)->Bool) -> (T)->Bool
{
    return { f1($0) || f2($0) }
}

func isIn<T: Comparable>(r: Range<T>) -> (T) -> Bool
{
    return { (r.startIndex <= $0) && ($0 < r.endIndex) };
}

let arr = [1,2,3,4,5,6,7,8]
let arr2 = filter(arr, isIn(0...2) || isIn(5...7))

if (isIn(0...2) || isIn(5...7))(value) {
    // …
}