Perlbuzz news roundup for 2016-05-27

May 27, 2016 News roundup 1 comment

It’s been a while since Perlbuzz.com has been up and running. Time for me empty the queue of the last two years of Twitter postings.

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Perlbuzz news roundup for 2014-09-15

September 15, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Template Toolkit’s DEFAULT directive does not short-circuit

September 15, 2014 CPAN No comments

Template Toolkit’s DEFAULT does not do short-circuit evaluation like you might think it would.
If you have

[% DEFAULT foo = user.calculate_foo; %]

Then the results of the method call user.calculate_foo are assigned to foo, unless foo already has a true value.
However, whether or not foo already has a true value, user.calculcate_foo is always invoked.
You might expect the code to look like this:

$foo = $user->calculate_foo() unless $foo;

But it’s really like this;

$temp = $user->calculate_foo();
$foo = $temp unless $foo;

So, if user.calculate_foo is an expensive function that you don’t want to invoke unless you have to, you’ll have to resort to an explicit IF block:

IF !foo;
    foo = user.calculate_foo;
END

It’s also worth noting that DEFAULT is not for checking if a variable is set, but for checking if it is true.

Perlbuzz news roundup for 2014-08-11

August 11, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Perlbuzz news roundup for 2014-07-14

July 14, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Perlbuzz news roundup for 2014-06-06

June 16, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Perlbuzz news roundup for 2014-05-19

May 19, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Perlbuzz news roundup for 2014-05-05

May 5, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Perlbuzz news roundup for 2014-04-21

March 31, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.

Perlbuzz news roundup for 2014-03-31

March 31, 2014 News roundup No comments

These links are collected from the
Perlbuzz Twitter feed.
If you have suggestions for news bits, please mail me at
andy@perlbuzz.com.