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POEnumerate or list all variables in a program of [your favorite language here]
 

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  1. POEnumerate or list all variables in a program of [your favorite language here]
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    <p>A friend asked me last week how to enumerate or list all variables within a program/function/etc. for the purposes of debugging (essentially getting a snapshot of everything so you can see what variables are set to, or if they are set at all). I looked around a bit and found a relatively good way for Python:</p> <pre> #!/usr/bin/python foo1 = "Hello world" foo2 = "bar" foo3 = {"1":"a", "2":"b"} foo4 = "1+1" for name in dir(): myvalue = eval(name) print name, "is", type(name), "and is equal to ", myvalue </pre> <p>which will output something like:</p> <pre> __builtins__ is &lt;type 'str'&gt; and is equal to &lt;module '__builtin__' (built-in)&gt; __doc__ is &lt;type 'str'&gt; and is equal to None __file__ is &lt;type 'str'&gt; and is equal to ./foo.py __name__ is &lt;type 'str'&gt; and is equal to __main__ foo1 is &lt;type 'str'&gt; and is equal to Hello world foo2 is &lt;type 'str'&gt; and is equal to bar foo3 is &lt;type 'str'&gt; and is equal to {'1': 'a', '2': 'b'} foo4 is &lt;type 'str'&gt; and is equal to 1+1 </pre> <p>I have so far found a partial way in PHP (courtesy of <a href="http://www.phpro.org/examples/List-all-variables.html" rel="noreferrer">link text</a>) but it only lists all variables and their types, not the contents:</p> <pre> &lt;?php // create a few variables $bar = 'foo'; $foo ='bar'; // create a new array object $arrayObj = new ArrayObject(get_defined_vars()); // loop over the array object and echo variables and values for($iterator = $arrayObj-&gt;getIterator(); $iterator-&gt;valid(); $iterator-&gt;next()) { echo $iterator-&gt;key() . ' =&gt; ' . $iterator-&gt;current() . '&lt;br /&gt;'; } ?&gt; </pre> <p><strong>So I put it to you: how do you list all variables and their contents in your favorite language?</strong></p> <hr> <p>Edit by <a href="https://stackoverflow.com/users/6309/vonc">VonC</a>: I propose this question follows the spirit of a little "<a href="https://stackoverflow.com/questions/172184">code-challenge</a>".<br> If you do not agree, just edit and remove the tag and the link.</p>
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    1. COIn python I'd just use locals/globals rather than the dir/eval you show above. See below.
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      1. USAaron Maenpaa
    2. COIn PHP it can also be done much easier, see my answer.
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      1. USPim Jager
    3. COThis is a hack of a question, because it's not asking about a specific issue, it's saying "let's see what you can do in your language?". It is a discussion question, because there is no one correct answer. Therefore it should probably be removed, but at the least marked community wiki. This is more a forum post.
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