Re^7: printing unitialized value of the 'do BLOCK'

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Re^8: printing unitialized value of the 'do BLOCK' by choroba (Cardinal) on Dec 19, 2019 at 15:07 UTC
I'm getting `[1][1]` from the above code. What version of perl do you run? `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l] [select]
Re^9: printing unitialized value of the 'do BLOCK' by ikegami (Patriarch) on Dec 19, 2019 at 17:46 UTC
`$ for v in 30 28 26 24 22 20 18 16 14 12 10; do printf '5.%s: ' $v 5.${v}t/bin/perl a.pl done 5.30: [1][1] 5.28: -bash: 5.28t/bin/perl: No such file or directory 5.26: [1][1] 5.24: [1][1] 5.22: [1][] 5.20: [1][] 5.18: [1][] 5.16: [1][] 5.14: [1][] 5.12: [1][] 5.10: [1][]` [download] I think it's an unintentional change that resulted from fixing this.	[reply] [d/l]
Re^8: printing unitialized value of the 'do BLOCK' by ikegami (Patriarch) on Dec 18, 2019 at 23:04 UTC
And there we go. The reason the value is only defined when the last statement is an expression.	[reply]
Re^9: printing unitialized value of the 'do BLOCK' by rsFalse (Chaplain) on Dec 18, 2019 at 23:26 UTC
I thought that '1' is also expression.	[reply]
Re^10: printing unitialized value of the 'do BLOCK' by ikegami (Patriarch) on Dec 19, 2019 at 00:13 UTC
But the return value is only defined when the last statement is an expression. The last statement is an `unless` statement, so the return value is undefined. We were discussing what value is returned even though it's undefined. But that's always dangerous. As you've pointed out, it doesn't always work. Update: Fixed typo (until=>unless)	[reply] [d/l]
Re^11: printing unitialized value of the 'do BLOCK' by soonix (Canon) on Dec 23, 2019 at 08:11 UTC
Re^12: printing unitialized value of the 'do BLOCK' (summary) by LanX (Saint) on Dec 25, 2019 at 18:38 UTC
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Re^11: printing unitialized value of the 'do BLOCK' by rsFalse (Chaplain) on Dec 22, 2019 at 23:29 UTC
Re^12: printing unitialized value of the 'do BLOCK' by ikegami (Patriarch) on Dec 24, 2019 at 14:55 UTC


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