Re^3: converting JSON to CSV

Just TIMTOWTDI...

AnomalousMonk already mentioned the issue with local. Localizing is pointless when it happens at top level - in the same way as my variables are global variables if declared at top level in a program that consists in just 1 file without imports.

So, local needs a place. A bare block is convenient:

my $text; # but see above ;-)
{
    local( $/, *FH ) ;
    open( FH, '<', 'aws.json' );
    $text = <FH>;
}
# $/ restored to default here
# FH is an empty typeglob in the symbol table
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perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

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Re^4: converting JSON to CSV by haukex (Archbishop) on Apr 08, 2017 at 09:14 UTC
Just to pick a nit: Localizing is pointless when it happens at top level Not entirely, e.g. if you've got a file `foo.pl` that does `local $/`, and a file `bar.pl` that does `do "foo.pl"` (any of eval/do/require/use), then `bar.pl` is protected from the change to `$/`. I know you also said "a program that consists in just 1 file", but I'd say `foo.pl` doesn't know if it's being run by `perl foo.pl` or by being done from another script, or perhaps being run in a persistent process. So localizing would be playing it safe.	[reply] [d/l] [select]

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Re^4: converting JSON to CSV
by haukex (Archbishop) on Apr 08, 2017 at 09:14 UTC

Just to pick a nit:

Localizing is pointless when it happens at top level

Not entirely, e.g. if you've got a file foo.pl that does local $/, and a file bar.pl that does do "foo.pl" (any of eval/do/require/use), then bar.pl is protected from the change to $/.

I know you also said "a program that consists in just 1 file", but I'd say foo.pl doesn't know if it's being run by perl foo.pl or by being done from another script, or perhaps being run in a persistent process. So localizing would be playing it safe.

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