>
>So, if I put a filehandle in the diamond, instead of empty diamond,
>does that mean that the first would operate line by line and the
>second would pull the whole file into memory?
>
When the diamond(<>) is appeared with while(),it means you read the file line
by line.
ig,while(<FILEHANDLE>){ .. } and while(<>} { .. } are almost the same.
When the diamond(<>) is appeared on list context,it would read all file content
in memory at one time.
ig,
my @file = <FILEHANDLE>;
or,
my @file = sort { ...} <FILEHANDLE>;
my @file = map { ...} <FILEHANDLE>;
my @file = grep { ... } <FILEHANDLE>;
This would slurp all the file content into memory.
but,when the diamond(<>) is appeared on scalar context,it just read one line
each time.
ig,
my $file = scalar <FILEHANDLE>;
or,
my $file = <FILEHANDLE>;
or just say,
<FILEHANDLE>;
This would read only one line in that file into memory.
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