| if [then] [else if] [else] end [if] |
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Syntax
If theBoolean then
(* code statements *)
else if anotherBool then
(* code statements *)
else
(* code statements *)
end if
Description
The compound if statement can be used to test
several boolean expressions and only execute
subsequent script code if the enclosing expression is
true. The syntax of the if
compound statement is almost exactly the same as Visual
Basic's, JavaScript's, and
Perl's, with some minor differences (for example, VB
pushes the else and if together to make
"elseif"). A plain-English
pseudocode translation of this statement would be,
"if this happens then run this code; else if that
happens then run this code; else (if neither of the first two things
happen) then run this default code." You do not have
to include any curly-brace characters ({ }) to enclose the
conditional script code that the if statement
contains. As long as you place different lines of code on separate
lines, then the then part of
if...then and the if part of
end if are optional, as in the following code. The
compiler puts the "thens" and
"end if" in the right places.
Examples
In the following example, the (current date)
 date "1/1/2001" is the tested
boolean expression. If it's
false, then the else
statement(s) will execute.
Set yearCount to 0
if (current date) date "1/1/2001" -- compiler will fill in 'then'
display dialog "Welcome to 2001"
set yearCount to yearCount + 1
else
display dialog "Enjoy the end of 2000"
end -- 'if' is optional
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