Perl updating hash of arrays

Posted by / 15-Feb-2017 23:54

Perl updating hash of arrays

This chapter will give you the basic understanding on how to process and manipulate dates and times in Perl.

Let's start with localtime() function, which returns values for the current date and time if given no arguments.

Perl programmers often use the two words function and subroutine interchangeably.

For example, let's say you'd like to prompt the user and ask a question: examples/simple_use strict; use warnings; ask_question(); my $answer = get_answer(); # some code ask_question(); my $second_answer = get_answer(); ########## sub declarations come here sub ask_question sub get_answer sub terminate into a single function call.

Certain languages allow or even require you to create "prototypes" before creating the actual subroutine. Actually, there is something called prototypes available in Perl, but they don't do what you might expect, and I don't recommend their usage. There are very few cases when those prototypes in Perl are useful.

In Perl 5 you don't need or can declare the signature of a function.

The output is exactly the same, but the code is slightly cleaner.

There are several modules on CPAN that help creating something that resembles signature. statement, and it imports a function, you can use that in your code without parentheses. There is even Perl:: Critic policy that will check your code and point out every function that does not have an explicit return call at the end of the function declaration.

OTOH if you put your function definitions at the end of the script - and I recommend you to do that - then you need to put parentheses when you are calling the function. If there is nothing to return just call Gabor who runs the Perl Maven site helps companies set up test automation, CI/CD Continuous Integration and Continuous Deployment and other Dev Ops related systems.

I have been working on the logic for this and after looking through the DBI docs, the Perl DBI book, and numerous threads, nodes and posts I am still stumped.

I have a db with records with say 40 pieces of data, if which I only want 3 fields per record.

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The id itself and two other pieces of data based on whether or not some bit is set, e.g.: The WHERE statement is just something I set to 1 later when I have manipulated the data.