Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Just as there are different operators for comparing strings and numbers, you should be aware how that affects accessing elements of hashes.

Consider the following:

my $key1 = '00001'; my $key2 = 1; my %hash1 = (1 => 1); my %hash2 = (1 , 2); my %hash3; $hash3{$key1} = 3; my %hash4; $hash4{$key2} = 4;
Obviously, $key1 == $key2, but $key1 ne $key2. That is, they are equal as numbers, but since $key1 is a string and $key2 is not, then they will not match using the eq string operator. This leads to the following:

00001 == 1 That is: $key1 == $key2 00001 ne 1 That is: $key1 ne $key2 $hash1{$key1} is undef $hash1{$key2} == 1 $hash2{$key1} is undef $hash2{$key2} == 2 $hash3{$key1} == 3 $hash3{$key2} is undef $hash4{$key1} is undef $hash4{$key2} == 4
This is particularly important when working with databases, for example, where the key field may be zerofilled.

In reply to Hash Keys (strings or numbers?) by robot_tourist

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (1)
As of 2023-03-21 04:50 GMT
Find Nodes?
    Voting Booth?
    Which type of climate do you prefer to live in?

    Results (59 votes). Check out past polls.