Assertions: Difference between revisions
→{{header|Wren}}: Added a second version using Wren-debug.
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[./assertion line 4] in new(_) block argument
[./assertion line 12] in (script)
</pre>
<br>
{{libheader|Wren-debug}}
The above module also provides limited support for assertions.
<syntaxhighlight lang="ecmascript">import "./debug" for Debug
var x = 42
Debug.assert("x == 42", 4, x == 42) // fine
Debug.off
Debug.assert("x > 42", 6, x > 42) // no error
Debug.on
Debug.assert("x > 42", 8, x > 42) // error</syntaxhighlight>
{{out}}
<pre>
ASSERTION on line 8 labelled 'x > 42' failed. Aborting fiber.
Assertion failure.
[./debug line 100] in assert(_,_,_)
[./assert line 8] in (script)
</pre>
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