passing a variable to a handler(function) in applescript - applescript

Question

test_two() and test_three work(), but test_one() does not. Why is that? How do I pass the argument into the handler and use it as a local variable?
set the_application to "Safari"
test_one(the_application)
on test_one(the_application)
tell application the_application
make new document with properties {URL:"http://www.stackoverflow.com"}
end tell
end test_one
# ----
test_two()
on test_two()
tell application "Safari"
make new document with properties {URL:"http://www.stackoverflow.com"}
end tell
end test_two
# ----
set the_application to "Safari"
test_three(the_application)
on test_three(the_application)
tell application the_application
activate
end tell
end test_three

Answer 1

Here is my other working solution, maybe, better than my first one:
set the_application to "Safari"
test_one(the_application)
on test_one(the_application)
set theScript to "tell application \"" & the_application & "\"
make new document with properties {URL:\"http://www.stackoverflow.com\"}
end tell"
run script theScript
end test_one

Answer 2

When you want use some terms common to multiple applications, you can do it using terms from one of them. This terms will work for other applications as well. You can indicate in the code's first line the name of any application, which has command make new document with properties and property URL,
set the_application to "some Safari like application"
test_one(the_application)
on test_one(the_application)
using terms from application "Safari"
tell application the_application
make new document with properties {URL:"http://www.stackoverflow.com"}
end tell
end using terms from
end test_one
Other example (creates new folder on the desktop):
set the_application to "Finder"
test_one(the_application)
on test_one(the_application)
using terms from application "System Events"
tell application the_application
make new folder with properties {name:"TestFolder"}
end tell
end using terms from
end test_one