Language Guide

CHAPTER 8
Handlers
234 Subroutine Definitions and Calls
The following subroutine uses the special label given to define a parameter
with the label rounding. By using verb forms ending with “ing” as labels, you
can often make subroutine calls easier to read.
to findNumbers of numberList above minLimit 
given rounding:roundBoolean
set resultList to {}
repeat with i from 1 to (count items of numberList)
set x to item i of numberList
if roundBoolean = true then
copy (x + 0.5) div 1 to x
end if
if x > minLimit then
copy resultList & x to resultList
end if
end repeat
return resultList
end findNumbers
--to call findNumbers:
findNumbers of myList above 3 given rounding:true
Another way to call the findNumbers subroutine is to use a With or Without
clause to specify the value of the rounding parameter. You can use With or
Without clauses to specify parameters whose values are true or false.
--this call is equivalent to the previous example
findNumbers of myList above 3 with rounding
The subroutine parameter labels that can be used without the special label
given allow you considerable flexibility in defining handlers that sound
English-like. For example, here’s a routine that takes any parameter that
can be displayed as a string and displays it in a dialog box:
on rock around the clock
display dialog (clock as string)
end rock