Boolean

A boolean attribute, variable or expression can be either true or false.

Boolean functions

QuodlyScript provides the Boolean functions true, false, and not.

Example

This example sets a boolean variable based on the value of a numeric variable. It returns true in myBoolean if the myVar value is set to 1 and false otherwise.

var myBoolean : boolean
var myVar : integer
if(myVar == 1)
    myBoolean = true //myBoolean is set to true
else
    myBoolean = false //myBoolean is set to false
end if

This example can be simplified into one line.

myBoolean = (myButton == 1)

Logical operators

QodlyScript supports two logical operators that work on Boolean expressions: conjunction (AND) and inclusive disjunction (OR). A logical AND returns true if both expressions are true. A logical OR returns true if at least one of the expressions is true. The following table shows the logical operators:

note

In boolean contexts, it is usually recommended to use short-circuit logical operators (&& and ||).

Operation	Syntax	Returns	Expression	Value
AND	Boolean & Boolean	Boolean	("A" == "A") & (15 != 3)	true
			("A" == "B") & (15 != 3)	false
			("A" == "B") & (15 == 3)	false
OR	Boolean | Boolean	Boolean	("A" == "A") | (15 != 3)	true
			("A" == "B") | (15 != 3)	true
			("A" == "B") | (15 == 3)	false

The following is the truth table for the AND logical operator:

Expr1	Expr2	Expr1 & Expr2
true	true	true
true	false	false
false	true	false
false	false	false

The following is the truth table for the OR logical operator:

Expr1	Expr2	Expr1 | Expr2
true	true	true
True	false	true
false	true	true
false	false	false

tip

If you need to calculate the exclusive disjunction between expr1 and expr2, evaluate:

 (expr1|expr2) & not(expr1 & expr2)