Re: the basic datatypes, three

To find the size of an array you can you can do scalar(@a) which would return 3 originally and 4 after $a[4] was set to 4;

I think you meant $a[3] and not $a[4] :)
I would also like to point at this node scalar vs list context, I think most Perl newcomers need to be introduces as soon as possible to those context issues,e.g.

What would happen if you assign a list value to a scalar variable?
And for this particular question the answer would be, the scalar get the size value of the list.
Why?
This is how Perl works, it's a ... rule.

I am commenting on this mainly to point out that it's not obvious why would scalar (@list) return the list size, one would expect a function like size @list. So it would be reasonable to justify and explain those issues sooner rather than later.
Most people like to learn why (the justification) things works in the way they do. Not just how (the rules).

Comment on Re: the basic datatypes, three

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Re^2: the basic datatypes, three by sanPerl (Friar) on Jan 24, 2006 at 11:22 UTC
Why do we need to key `scalar(@list)` when only `@list` would also work? for e.g. `use strict; my @abc= ('a','b','c','d'); my $x= @abc; my $y = scalar(@abc); print $x."#".$y;` [download] Here $x & $y both return 4.	[reply] [d/l] [select]
Re^3: the basic datatypes, three by merlyn (Sage) on Jan 24, 2006 at 14:10 UTC
The "scalar" op is needed only to provide scalar context in an otherwise list context space. For example: `my @lengths = scalar @x, scalar @y, scalar @z; # but... my $length_x = @x; my $length_y = @y; my $length_z = @z;` [download] The scalar is needed in the first example because the array names are in a list context otherwise. -- Randal L. Schwartz, Perl hacker Be sure to read my standard disclaimer if this is a reply.	[reply] [d/l]
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Re^2: the basic datatypes, three by Happy-the-monk (Canon) on May 10, 2006 at 09:25 UTC
What would happen if you assign a list value to a scalar variable? And for this particular question the answer would be, the scalar get the size value of the list. In your post, you keep mixing up `list` and `array` behaviour/context - or maybe you just misnamed "array" as "list". see davorgs post further below to clarify the difference. Cheers, Sören	[reply]
Re^3: the basic datatypes, three by Anonymous Monk on Nov 30, 2007 at 15:30 UTC
is there any possible way to find, what type is a variable of these three types.	[reply]


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