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I'm thinking that's a good reason to contribute to some open source projects. Unless, of course, your employer prohibits you from doing so... in which case I has a sad for you. :(

More code just increases the reliability of the assessment. Even a very small amount of code is enough to decide whether to skip the resume or follow up on it.

Unless their name is on a (good) Perl book I'd skip over anyone who won't submit even a small code sample.

Well said. The bulk of my recent code is simply not available for public use.