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(Created page with "{{DISPLAYTITLE:_ASSERT}} The _ASSERT statement can be used to perform tests in code that's in development, for debugging purposes. {{PageSyntax}} :_ASSERT {{Parameter|condition}}[, {{Parameter|errorMessage$}}] {{PageDescription}} * {{Parameter|condition}} is the condition that must be met in order to consider the _ASSERT valid. * Optional {{Parameter|errorMessage$}} is the message to be displayed in the console window if $ASSERTS:CONSOLE is use...") |
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{{PageAvailability}} | |||
* '''Version 1.4 and up'''. | * '''Version 1.4 and up'''. | ||
{{PageExamples}} | {{PageExamples}} | ||
''Example:'' Adding test checks for parameter inputs in a function. | ''Example:'' Adding test checks for parameter inputs in a function. | ||
{{CodeStart}} | {{CodeStart}} | ||
{{ | {{Cm|$ASSERTS}}:CONSOLE | ||
{{Cl|DO}} | {{Cl|DO}} | ||
a = {{Cl|INT}}({{Cl|RND}} * 10) | a = {{Cl|INT}}({{Cl|RND}} * {{Text|10|#F580B1}}) | ||
b$ = myFunc$(a) | b$ = {{Text|myFunc$|#55FF55}}(a) | ||
{{Cl|PRINT}} a, , b$ | {{Cl|PRINT}} a, , b$ | ||
{{Cl|_LIMIT}} 3 | {{Cl|_LIMIT}} {{Text|3|#F580B1}} | ||
{{Cl|LOOP}} {{Cl| | {{Cl|DO...LOOP|LOOP UNTIL}} {{Cl|_KEYHIT}} | ||
{{Cl|END}} | |||
{{Cl|FUNCTION}} myFunc$ (value {{Cl|AS}} {{Cl|SINGLE}}) | |||
{{Cl|_ASSERT}} value > 0, "Value cannot be zero" | {{Cl|FUNCTION}} {{Text|myFunc$|#55FF55}} (value {{Cl|AS}} {{Cl|SINGLE}}) | ||
{{Cl|_ASSERT}} value <= 10, "Value cannot exceed 10" | {{Cl|_ASSERT}} value > {{Text|0|#F580B1}}, {{Text|<nowiki>"Value cannot be zero"</nowiki>|#FFB100}} | ||
{{Cl|_ASSERT}} value <= {{Text|10|#F580B1}}, {{Text|<nowiki>"Value cannot exceed 10"</nowiki>|#FFB100}} | |||
{{Cl|IF}} value > 1 {{Cl|THEN}} plural$ = "s" | |||
myFunc$ = {{Cl|STRING$}}(value, "*") + {{Cl|STR$}}(value) + " star" + plural$ + " :-)" | {{Cl|IF}} value > {{Text|1|#F580B1}} {{Cl|THEN}} plural$ = {{Text|<nowiki>"s"</nowiki>|#FFB100}} | ||
{{Text|myFunc$|#55FF55}} = {{Cl|STRING$}}(value, {{Text|<nowiki>"*"</nowiki>|#FFB100}}) + {{Cl|STR$}}(value) + {{Text|<nowiki>" star"</nowiki>|#FFB100}} + plural$ + {{Text|<nowiki>" :-)"</nowiki>|#FFB100}} | |||
{{Cl|END FUNCTION}} | |||
{{CodeEnd}} | {{CodeEnd}} | ||
Latest revision as of 14:15, 19 March 2023
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 END 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