Re: Textfile to array or hash

Bill H <bill@xxxxxxxxx> wrote:
I havent used push before, does it perform the same exact function as
using "="? So in you sexample:

push @artists, $data[ 2 ] if $data[ 0 ] > 50;

Would this be the exact equivalent of doing:

if ($data[0] > 50){$artists[@artists] = $data[2];}

Yes, here it does. It simply appends '$data[2]' to the end of
the '@artists' array. And it does it more efficiently (at
least that's what the documentation claims).

Or does more happen with push?

Well, you can also 'push' a whole list, thus appending a number
of new elements to the array. So you can e.g. do

my @a = ( 1, 2, 3 );
my @b = ( 4, 5, 6 );
push @a, @b;

to concatenate @a and @b. And it returns the new number of
elements of the array.

Just for the record the last time I
ever used a "push" command was in Z80 ML programming on a Timex
Sinclair 1000 (bout 3 years ago).

It's a bit similar as far as I remember (but it's nearly 20
years since I last used a Z80). There the PUSH command moved
the content of a register onto the stack, automatically de-
crementing the stack pointer by two (and POP moved data back
from the stack into a register and incremented SP twice).
Perl's push() and pop() functions allow you to use each array
as a kind of stack.
Regards, Jens
--
\ Jens Thoms Toerring ___ jt@xxxxxxxxxxx
\__________________________ http://toerring.de
.

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