Manual

ifelse
114
ifelse
Description
Conditionally executes one of two procedures based upon a boolean value.
Usage
AnyBool TrueProc FalseProc ifelse
AnyBool Boolean. Value which determines whether or not PAL executes TrueProc or
FalseProc. A value of
true
instructs the interpreter to execute TrueProc. A
value of false instructs PAL to execute FalseProc.
TrueProc Procedure. The procedure for PAL to execute given a value of true for
AnyBool.
FalseProc Procedure. The procedure for PAL to execute given a value of false for
AnyBool.
Comments
This operator provides the PAL programmer with the ability to execute one of two procedures.
Typically the boolean value AnyBool would result from the execution of a comparison operator
like eq or gt.
The ifelse operator removes all three parameters from the stack before invoking the selected pro-
cedure. The ifelse operator does not place any results onto the stack. However, the executed pro-
cedure may place one or more results onto the stack if desired.
Hints
The
if
operator discussion includes hints which also apply to the
ifelse
operator.