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| Related Syntax | Related Concepts | ||||||||
| constant | true, false | ||||||||
Purpose
True and false are Boolean values that you can use to set or test the value of switch variables:
process
local switch fred
local switch barney variable initial-size 3 initial {true, false, true}
set fred to true
do when fred = true
output "Switch fred is true!%n"
else
output "Switch fred is false!%n"
done
set barney[3] to false
do when barney[3] = false
output "Switch barney[3] is false!%n"
else
output "Switch barney[3] is true!%n"
done
; Output: "Switch fred is true!
; Switch barney[3] is false!"
Note that switch variables return a true or false value directly so that do when fred = true and do when fred do the same thing. Similarly, do when fred = false does the same thing as do unless fred.
While all switches default to false, you should explicitly set the value of all variables before using them. This makes your programs easier to read and helps avoid errors.
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Related Syntax activate, deactivate active |
Related Concepts Switch data type |
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