func1 = (string_array) => string_array                  // array of strings
PRE_check_func1 = (string_array) => { 
  return type_czech.checkParam_type(string_array, ['strings'])
}
func1 = type_czech.linkUp(func1, PRE_check_func1)
func1(['pass', 'a-string'])                                    // pass
func1(['fail', 12])                                            // fail - 12

func2 = (string_array_2) => string_array_2            // array of 2 strings
PRE_check_func2 = (string_array_2) => { 
  type_signature = ['string', 'string']
  return type_czech.checkParam_type(string_array_2, type_signature)
}
func2 = type_czech.linkUp(func2, PRE_check_func2)
func2([ 'pass', 'two'])                                // pass
func2([ 'fail', 'two', 'three'])                       // fail - 3 elements

func3 = (arr_of_arr) => arr_of_arr                      // arrays of arrays
PRE_check_func3 = (arr_of_arr) => {
  return type_czech.checkParam_type(arr_of_arr, ['arrays'])
}
func3 = type_czech.linkUp(func3, PRE_check_func3)
func3([  [],  ['a'], [2], ['pass', 3]  ])               // pass
func3([  [],  [], [], 'fail'  ])                        // fail - not array

func4 = (arr_str_num_arrs) => arr_str_num_arrs          //[str, num] arrays
PRE_check_func4 = (arr_str_num_arrs) => {    
  the_signature = [ ['string', 'number'],  ['string', 'number'] ]
  return type_czech.checkParam_type(arr_str_num_arrs, the_signature)
}
func4 = type_czech.linkUp(func4, PRE_check_func4) 
func4([  ['a', 1], ['pass', 4]  ])                              // pass
func4([  ['a', 1], ['fail', 'X']  ])                            // fail - X

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