Re^3: appending a variable

Aktchually they compile down to the same thing under the hood (because the former is just syntactic sugar for the latter more or less):

$ perl -MO=Deparse,-p,-q -E 'my $foo = qq{a_${blah}_b}; my $bar = q{a_
+} . $blah . q{_b};'
use feature 'current_sub', 'bitwise', 'evalbytes', 'fc', 'postderef_qq
+', 'say', 'state', 'switch', 'unicode_strings', 'unicode_eval';
(my $foo = 'a_' . $blah . '_b');
(my $bar = 'a_' . $blah . '_b');
-e syntax OK
[download]

The cake is a lie.
The cake is a lie.
The cake is a lie.

Comment on Re^3: appending a variable Download Code

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Re^4: appending a variable by pragovnj (Acolyte) on Apr 28, 2022 at 21:13 UTC
Hi, I got an error "Can't call method "YYYYmmddHHMMSS" on an undefined value" at $FN_OUTPUT This is my code `my $vmstr = "zldcdyh1bdce2d14-xxx-vccpohr-correlator-0"; my ($opstr) = $vmstr =~ /-(\d\d)$/; #using the value of $vmstr + of the VM but with an added 0 my $OPinst = "/PMOSS_SIPNBVQM_5MIN_OHDR_${YYYYmmddHHMMSS$opstr}"; my $P3inst = "/PMOSS_P3_SIPNBVQM_5MIN_OHDR_${YYYYmmddHHMMSS$opstr +}"; $FN_OUTPUT = "$DST_DIR${OPinst}_${INSTANCE}_$$"; # Suff +ixes added later: .processing .completed $FN_P3_OUTPUT ="$DST_DIR${P3inst}_${INSTANCE}_$$"; # Suf +fixes added later: .processing .completed` [download] Is this incorrect	[reply] [d/l]
Re^5: appending a variable by hippo (Bishop) on Apr 28, 2022 at 21:35 UTC
Yes, it is incorrect. You now have a $ inside braces - why have you done that? Fixing these 8 lines in isolation gives: `my $vmstr = "zldcdyh1bdce2d14-xxx-vccpohr-correlator-0"; my ($opstr) = $vmstr =~ /-(\d\d)$/; #using the value of $vmstr + of the VM but with an added 0 my $OPinst = "/PMOSS_SIPNBVQM_5MIN_OHDR_$YYYYmmddHHMMSS$opstr"; my $P3inst = "/PMOSS_P3_SIPNBVQM_5MIN_OHDR_$YYYYmmddHHMMSS$opstr" +; $FN_OUTPUT = "$DST_DIR${OPinst}_${INSTANCE}_$$"; # Suff +ixes added later: .processing .completed $FN_P3_OUTPUT ="$DST_DIR${P3inst}_${INSTANCE}_$$"; # Suf +fixes added later: .processing .completed` [download] Note however that $INSTANCE is undefined. It is always best to provide an SSCCE. 🦛	[reply] [d/l]
Re^6: appending a variable by pragovnj (Acolyte) on Apr 28, 2022 at 22:26 UTC
Hi, After removing the inside braces, there is no error. However, I am not seeing the value of $opstr added to YYYmmddHHMMSS. It should be YYYmmddHHMMSS00 in this case. PMOSS_P3_SIPNBVQM_5MIN_OHDR_20220428221115__31571.processing should be PMOSS_P3_SIPNBVQM_5MIN_OHDR_2022042822111500__31571.processing $INSTANCE is something which the server adds and in this case it is 31571. `my ($opstr) = $vmstr =~ /-(\d\d)$/; #using the value of $vmstr of +the VM but with an added 0 my $OPinst = "/PMOSS_SIPNBVQM_5MIN_OHDR_$YYYYmmddHHMMSS$opstr"; my $P3inst = "/PMOSS_P3_SIPNBVQM_5MIN_OHDR_$YYYYmmddHHMMSS$opstr" +; $FN_OUTPUT = "$DST_DIR${OPinst}_${INSTANCE}_$$"; # Suff +ixes added later: .processing .completed $FN_P3_OUTPUT ="$DST_DIR${P3inst}_${INSTANCE}_$$"; # Suf +fixes added later: .processing .completed` [download]	[reply] [d/l]
Re^7: appending a variable by GrandFather (Saint) on Apr 28, 2022 at 23:36 UTC
Re^7: appending a variable by Marshall (Canon) on Apr 29, 2022 at 01:28 UTC
Re^8: appending a variable by pragovnj (Acolyte) on Apr 29, 2022 at 13:35 UTC
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