Re^4: exit this way


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Re^4: exit this way

by Your Mother (Archbishop)

on Sep 01, 2015 at 15:45 UTC ( [id://1140681]=note: print w/replies, xml )

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in reply to Re^3: exit this way
in thread exit this way

:P The last expression of a sub/block/package is its return value; when there is no explicit return. So that little snippet just rotates returning "true" and "false" randomly; idiom: return 0 or 1 element of anon array with 2 elements, one true, one false. By adding a print you made the sub always return "true."

exit values are approximately opposed to return/success values in most Perl. The bang (!) performs this inversion. exit == 0 means success, any other value (-1, 1 .. 255) means some flavor of fail (on *nix anyway). Why I suggest it is cognitively a bad idea for a Perl script. To test the original, try these instead (with 1140673.pl being the first scriptlet I posted)-

moo@cow~>1140673.pl && echo "I CAN HAZ SUCCEED?"
moo@cow~>1140673.pl || echo "FAIL!"
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Re^5: exit this way by 1nickt (Canon) on Sep 01, 2015 at 16:16 UTC
OK, I see. Ugh, the Vague One obfuscated my thoughts ... I was focusing on whether the sub would be executed when called as the argument to `exit()`, rather than what that would make the output of the script via `exit()`. Thanks. The way forward always starts with a minimal test.	[reply] [d/l] [select]

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