how to get the number of keys in an hash

[Liang]

Hi,

I need to get the number of keys in an hash. Is there any convenient way to
get it?

or use the following one?
foreach $v (keys %hash){
$count++;
}

Thanks in advance,
Liang

[Jürgen Exner]

Liang wrote:

Hi,

I need to get the number of keys in an hash. Is there any convenient
way to get it?

or use the following one?
foreach $v (keys %hash){
$count++;
}

Oh dear, that's a rather creative way....

Trivial. Just use "keys(%hash)" in scalar context, e.g.
my $number = keys %hash;

jue

[Jeff Dunn]

"Liang" <le*********@hotmail.com> wrote in message news:<cg**********@newshost.mot.com>...

Hi,

I need to get the number of keys in an hash. Is there any convenient way to
get it?

or use the following one?
foreach $v (keys %hash){
$count++;
}

Thanks in advance,
Liang

Try

$keyCount=(%keys %hash);

[nobull]

"Liang" <le*********@hotmail.com> wrote in message news:<cg**********@newshost.mot.com>...

Hi,

I need to get the number of keys in an hash. Is there any convenient way to
get it?
Yes, the keys() function.
or use the following one?
foreach $v (keys %hash){
$count++;
}
No, that is not necesary.

This newsgroup does not exist (see FAQ). Please do not start threads here.
Thanks in advance,

If you are going to do any things "in advance" then my suggestions would be:

1) Check the FAQ.
2) Check the documentation for the functions you are using.

[Steve Bennett]

Everyone says "See FAQ". Could you please include the URL to the FAQ?
Be kind to newbies......You used to be one.

-s

no****@mail.com wrote:

"Liang" <le*********@hotmail.com> wrote in message news:<cg**********@newshost.mot.com>...

Hi,

I need to get the number of keys in an hash. Is there any convenient way to
get it?

Yes, the keys() function.

or use the following one?
foreach $v (keys %hash){
$count++;
}

No, that is not necesary.

This newsgroup does not exist (see FAQ). Please do not start threads here.

Thanks in advance,

If you are going to do any things "in advance" then my suggestions would be:

1) Check the FAQ.
2) Check the documentation for the functions you are using.

[Joe Smith]

Steve Bennett wrote:

Everyone says "See FAQ". Could you please include the URL to the FAQ?

What happens when you do a Google search on "perl faq"?
Newbies are expected to know that Google is their friend.

[Jürgen Exner]

Steve Bennett wrote:

Everyone says "See FAQ". Could you please include the URL to the FAQ?
No need for a URL, it's on your own harddrive (after you installed Perl)
Just type
perldoc perlfaq
Be kind to newbies......You used to be one.

You also seem to be new to Usenet. It is considered rude to
- top post
- blindly full quote
For an explanation of what that is and why it's considered rude please
search www.google.com

jue

[nobull]

Steve Bennett rudely spits TOFU in may face:

Everyone says "See FAQ". Could you please include the URL to the FAQ?
You are supposed to look for a FAQ _before_ you ask a question. It
would defeat the purpose if the FAQ was so hard to find that asking
where it was was a ligitimate question. Anything you could reasonably
imagine doing to locate the Perl FAQ will succede in about fifteen
seconds.
Be kind to newbies.

I am. Teaching newbies that selfishness is rewarded is _not_ a
kindness.