Thank you for the explanation. Let me see if I have this right:
- There are two contexts in which an expression can be evaluated: scalar and list.
- There are three major types of variables in perl: scalars, arrays, and hashes. 'Scalar' variable type and 'scalar' context are not the same thing, although scalar variables usually impose scalar context.
- Expressions are either constants, the values of variables (either lvalue or rvalue), or the results of functions which may take other expressions as arguments.
So my principle error lies in trying to compare lists and arrays, which are different types of things. The confusion is partly caused by 'scalar' being both a context and a
variable, and thus capable of being compared with either. Hence, comparisons are not transitive!
Is this right?
Be bloody, bold, and resolute; laugh to scorn
The power of man...
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>
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
Want more info? How to link or
or How to display code and escape characters
are good places to start.