User Guide

if 209
See also
showGlobals(), property, gotoNetMovie
if
Usage
if logicalExpression then statement
if logicalExpression then statement
else statement
end if
if logicalExpression then
statement(s)
end if
if logicalExpression then
statement(s)
else
statement(s)
end if
if logicalExpression1 then
statement(s)
else if logicalExpression2 then
statement(s)
else if logicalExpression3 then
statement(s)
end if
if logicalExpression1 then
statement(s)
else logicalExpression2
end if
Description
Keyword; if...then structure that evaluates the logical expression specified by
logicalExpression.
• If the condition is TRUE, Lingo executes the statement(s) that follow then.
• If the condition is FALSE, Lingo executes the statement(s) following else. If no statements
follow
else, Lingo exits the if...then structure.
• All parts of the condition must be evaluated; execution does not stop at the first condition that
is met or not met. Thus, faster code may be created by nesting
if...then statements on
separate lines instead of placing them all on the first line to be evaluated.
When the condition is a property, Lingo automatically checks whether the property is
TRUE. You
don’t need to explicitly add the phrase
= TRUE after the property.
The else portion of the statement is optional. To use more than one then-statement or
else-statement, you must end with the form end if.
The else portion always corresponds to the previous if statement; thus, sometimes you must
include an
else nothing statement to associate an else keyword with the proper if keyword.
Note: A quick way to determine in the script window if a script is paired properly is to press Tab. This
forces Director to check the open Script window and show the indentation for the contents. Any
mismatches will be immediately apparent.