If
Purpose 
Evaluates a Boolean calculation and performs a conditional action based on that evaluation.
Format 
If [<Boolean calculation>]
Options 
Click Specify to define the Boolean calculation. In the Specify Calculation dialog box, type the calculation you want evaluated, or use the field list (on the left) and the functions list (on the right) with the mathematical and text operators to build the calculation.
Compatibility 
This script step is also supported in web publishing and in a FileMaker Server scheduled script.
Description 
If the calculation result is any number except zero, the calculation evaluates to True and the subsequent script steps are executed. If the calculation result is zero, no data, or does not resolve into a number, then the calculation evaluates to False and the subsequent script steps are not executed.
Every If step must have a corresponding End If script step somewhere after the If step and at the same indentation. Whenever you use an If script step, the Manage Scripts feature automatically enters an End If step.
You can also add additional conditions by using the Else If script step and Else script step.
Note  If you do not specify a calculation or if the calculation is unsuccessful, it will evaluate as False. Use the Get(LastError) function to capture these errors.
Examples 
If [Get (AccountName) = "Jim Davis"]
Go to Layout [“File One”]
Perform Find [Restore]
End If
Related topics 
Defining calculation fields
If function
If structure example
Script steps reference (alphabetical list)
Script steps reference (category list)
About formulas