println("hello there")                                                          //hello there
                                                                                //res0: Unit = ()
// Int => Int lambda                                                            //
val cube = (i: Int) => i * i * i                                                //
                                                                                //cube: Int => Int = <function1>
// `def` with curried params                                                    //
def mapRangeSumCurried(f: Int => Int)(start: Int, end: Int) = {                 //
  start to end map f sum                                                        //mapRangeSumCurried: mapRangeSumCurried[](val f: Int => Int)(val start: Int,val end: Int) => Int
}                                                                               //
                                                                                //
var result = mapRangeSumCurried(cube)(1, 10)                                    //
                                                                                //result: Int = 3025
// `def` function without currying params                                       //
def mapRangeSumNonCurried(f: Int => Int) : (Int, Int) => Int = {                //
  (start, end) => {                                                             //mapRangeSumNonCurried: mapRangeSumNonCurried[](val f: Int => Int) => (Int, Int) => Int
    start to end map f sum                                                      //
  }                                                                             //
}                                                                               //
                                                                                //
assert(result == mapRangeSumNonCurried(cube)(1, 10))                            //
result = mapRangeSumNonCurried(cube)(1, 10)                                     //res1: Unit = ()
                                                                                //result: Int = 3025
// `val` function with curried params                                           //
val mapRangeSumCurried1 = (f: Int => Int) => (start: Int, end: Int)  => {       //
  start to end map f sum                                                        //mapRangeSumCurried1: (Int => Int) => ((Int, Int) => Int) = <function1>
}                                                                               //
assert(result == mapRangeSumCurried1(cube)(1, 10))                              //
result = mapRangeSumCurried1(cube)(1, 10)                                       //res2: Unit = ()
                                                                                //result: Int = 3025
// `val` function without curried params                                        //
val mapRangeSumNonCurried1 = (f: Int => Int) => {                               //
  (start: Int, end: Int) => {                                                   //mapRangeSumNonCurried1: (Int => Int) => ((Int, Int) => Int) = <function1>
    (start to end).map(x => f(x)).sum                                           //
  }                                                                             //
}                                                                               //
assert(result == mapRangeSumNonCurried1(cube)(1, 10))                           //
                                                                                //res3: Unit = ()
                                                                                //