Slick wrote:
Just clarification. At this time I have not written any of my code
(dont' know where to begin yet, however the website that I am looking
at perl.begin.org seems to have diffrent methods for one item. I have
seen @ for arrays written like this: @myarray ,but I have also seen
an array per the perl.begin.org writting like:
$primes[$num_primes]. Are they both the same? Because it would be
easier in my opinion to write:
@myarray = 4;
instead of writing this:
$primes[$num_primes] = 2;
Am I mising something, or are these two things interchangable?
In Perl a '$' in front of a variable name indicates a scalar value so an
array name (or a hash name) with a '$' in front of it indicates that you
are accessing a single scalar value from an array (or hash.) So ...
@array
Indicates a complete array of zero or more scalar elements. And ...
$array[ EXPRESSION ]
Indicates a single scalar value from that array, where EXPRESSION is any
valid Perl expression that is evaluated as an integer to determine which
element to access. Then there is also ...
@array[ LIST ]
Indicates that LIST is evaluated as a list of integers to determine the
list of elements to access. This is called an array slice.
The same idea works for hashes:
%hash
$hash{ EXPRESSION }
@hash{ LIST }
perldoc perldata
John
--
The programmer is fighting against the two most
destructive forces in the universe: entropy and
human stupidity. -- Damian Conway
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