Re: Non-deprecated way to capture array length

[John W. Krahn]

Marc Sacks wrote:
> John W. Krahn wrote:
> 
>> Marc Sacks wrote:
>>
>>> I needed to find out the length of an array and did it by referencing
>>> the array in scalar context. However, "use warnings" indicated that this
>>> is a deprecated feature.  Is there a non-deprecated way to do this
>>> (other than looping through the whole array until I run out of
>>> elements)? Thanks.
>>
>> Using an array in scalar context is *not* deprecated.
>>
>> Since you haven't shown any code I would have to guess that you are using
>> defined() on an array which *is* deprecated.
>
> Actually, what I did was something like

"what I did was something like" is not the same as "this is the actual code
that produced the warning".


> my @arr = (a,b,c,d,e);
> $length = $arr;

@arr and $arr are two separate variables, the second of which is not even an
array.  There is nothing in that example that should produce a warning message.




John
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certain sorts of tools at low cost and in short order.   -- Larry Wall

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RE: Non-deprecated way to capture array length

[Helliwell, Kim]

-Original Message-
From: Jeff Pang [mailto:[EMAIL PROTECTED] 
Sent: Monday, October 09, 2006 8:25 AM
To: beginners
Subject: RE: Non-deprecated way to capture array length


>-- 
>Perhaps I'm behind the times here, but what's wrong with:
>
>my $num = $#array
>
>??

[EMAIL PROTECTED] ~]$ perl -Mstrict -Mwarnings -le 'my @arr=qw/aa bb
cc/;print $#arr'  
2
[EMAIL PROTECTED] ~]$ perl -Mstrict -Mwarnings -le 'my @arr=qw/aa bb
cc/;print scalar @arr'
3

They are not the same.
The $#arr is the last element's index number,while 'scalar @arr' is all
the elements' total number.

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Jeff Pang
NetEase AntiSpam Team
http://corp.netease.com

-- 

Oops, you're right! Guess I'm still half asleep this morning.
But $#arr + 1 is surely another way to get the result sought.
That's the way I always do it, not realizing that scalar @arr
was even available, I guess. However, scalar @arr is computationally
more efficient, I bet, and only slightly longer to write. So it's
probably a better way.

I'm not exactly a Perl beginner, but looks like I learned something
already from this list. Pretty good, seeing I only signed up 3 days
ago

Kim Helliwell
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Cell: 408 832 5365
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RE: Non-deprecated way to capture array length

[Jeff Pang]

>-- 
>Perhaps I'm behind the times here, but what's wrong with:
>
>my $num = $#array
>
>??

[EMAIL PROTECTED] ~]$ perl -Mstrict -Mwarnings -le 'my @arr=qw/aa bb cc/;print 
$#arr'  
2
[EMAIL PROTECTED] ~]$ perl -Mstrict -Mwarnings -le 'my @arr=qw/aa bb cc/;print 
scalar @arr'
3

They are not the same.
The $#arr is the last element's index number,while 'scalar @arr' is all the 
elements' total number.

--
Jeff Pang
NetEase AntiSpam Team
http://corp.netease.com

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RE: Non-deprecated way to capture array length

[Helliwell, Kim]

-Original Message-
From: Jeff Pang [mailto:[EMAIL PROTECTED] 
Sent: Monday, October 09, 2006 7:48 AM
To: beginners
Subject: Re: Non-deprecated way to capture array length


>
>>I needed to find out the length of an array and did it by referencing 
>>the array in scalar context. However, "use warnings" indicated that
this 
>>is a deprecated feature.  Is there a non-deprecated way to do this 
>>(other than looping through the whole array until I run out of 
>>elements)? Thanks.
>>
>
>How do you write it? I can get it like:
>
>$ perl -Mstrict -Mwarnings -le 'my @arr=qw/aa bb cc/;print length(join
"",@arr)'  
>6
>

Sorry, if you mean the number of elements in an array,then it should be:

my $num = scalar @array;

--
Jeff Pang
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http://corp.netease.com

-- 
Perhaps I'm behind the times here, but what's wrong with:

my $num = $#array

??

That's how I always do it.

Kim Helliwell
LSI Logic Corporation
Work: 408 433 8475
Cell: 408 832 5365
[EMAIL PROTECTED]
 
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Re: Non-deprecated way to capture array length

[Jeff Pang]

>
>>I needed to find out the length of an array and did it by referencing 
>>the array in scalar context. However, "use warnings" indicated that this 
>>is a deprecated feature.  Is there a non-deprecated way to do this 
>>(other than looping through the whole array until I run out of 
>>elements)? Thanks.
>>
>
>How do you write it? I can get it like:
>
>$ perl -Mstrict -Mwarnings -le 'my @arr=qw/aa bb cc/;print length(join 
>"",@arr)'  
>6
>

Sorry, if you mean the number of elements in an array,then it should be: 
my $num = scalar @array;

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Re: Non-deprecated way to capture array length

[John W. Krahn]

Marc Sacks wrote:
> I needed to find out the length of an array and did it by referencing
> the array in scalar context. However, "use warnings" indicated that this
> is a deprecated feature.  Is there a non-deprecated way to do this
> (other than looping through the whole array until I run out of
> elements)? Thanks.

Using an array in scalar context is *not* deprecated.

Since you haven't shown any code I would have to guess that you are using
defined() on an array which *is* deprecated.



John
-- 
Perl isn't a toolbox, but a small machine shop where you can special-order
certain sorts of tools at low cost and in short order.   -- Larry Wall

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Re: Non-deprecated way to capture array length

[Derek B. Smith]

--- Marc Sacks <[EMAIL PROTECTED]> wrote:

> I needed to find out the length of an array and did
> it by referencing 
> the array in scalar context. However, "use warnings"
> indicated that this 
> is a deprecated feature.  Is there a non-deprecated
> way to do this 
> (other than looping through the whole array until I
> run out of 
> elements)? Thanks.
> 

Hi Mark, 

the best practice/standard way to get an array length
is:

print scalar @array_name,"\n";
or
my $array_lnght = scalar @array_name;

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Re: Non-deprecated way to capture array length

[Jeff Pang]

>I needed to find out the length of an array and did it by referencing 
>the array in scalar context. However, "use warnings" indicated that this 
>is a deprecated feature.  Is there a non-deprecated way to do this 
>(other than looping through the whole array until I run out of 
>elements)? Thanks.
>

How do you write it? I can get it like:

$ perl -Mstrict -Mwarnings -le 'my @arr=qw/aa bb cc/;print length(join 
"",@arr)'  
6

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Non-deprecated way to capture array length

[Marc Sacks]

I needed to find out the length of an array and did it by referencing 
the array in scalar context. However, "use warnings" indicated that this 
is a deprecated feature.  Is there a non-deprecated way to do this 
(other than looping through the whole array until I run out of 
elements)? Thanks.


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