Monks, please help. I need to find the unique number of values in a hash of hashes. For example, given the array below, I need to know how many kids are 12 years old.
%hoh = (
kevin => {
age => "12",
favorite_color => "blue",
gender => "boy",
},
john => {
age => "11",
favorite_color => "green",
gender => "boy",
},
lisa => {
age => "11",
favorite_color => "pink",
gender => "girl",
},
sara => {
age => "13",
favorite_color => "purple",
gender => "girl",
},
shelly => {
age => "12",
favorite_color => "purple",
gender => "girl",
},
);
How many kids are 12? In this case 2. Is there a quick way to get this number without looping through each hash and counting?
-
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.