_ASSERT
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The _ASSERT statement can be used to perform tests in code that's in development, for debugging purposes.
Syntax
- _ASSERT condition[, errorMessage$]
Description
- condition is the condition that must be met in order to consider the _ASSERT valid.
- Optional errorMessage$ is the message to be displayed in the console window if $ASSERTS:CONSOLE is used.
- If the condition is not met (that is, if it evaluates to 0), an error occurs ("_ASSERT failed on line #") and program execution stops.
Availability
- Version 1.4 and up.
Examples
Example: Adding test checks for parameter inputs in a function.
$ASSERTS:CONSOLE DO a = INT(RND * 10) b$ = myFunc$(a) PRINT a, , b$ _LIMIT 3 LOOP UNTIL _KEYHIT FUNCTION myFunc$ (value AS SINGLE) _ASSERT value > 0, "Value cannot be zero" _ASSERT value <= 10, "Value cannot exceed 10" IF value > 1 THEN plural$ = "s" myFunc$ = STRING$(value, "*") + STR$(value) + " star" + plural$ + " :-)" END FUNCTION
See also
