4D Doc Center : Boolean Commands

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4D v14.3

Boolean Commands

4D includes Boolean functions, are used for Boolean calculations:

 True

 False

 Not

Example

This example sets a Boolean variable based on the value of a button. It returns True in myBoolean if the myButton button was clicked and False if the button was not clicked. When a button is clicked, the button variable is set to 1.

 If(myButton=1) ` If the button was clicked

    myBoolean:=True ` myBoolean is set to True

 Else ` If the button was not clicked,

    myBoolean:=False ` myBoolean is set to False

 End if

The previous example can be simplified into one line.

myBoolean:=(myButton=1)