40 - set the record straight

[demobox]

Thanks, @edofic! I like the setup. A couple of quick housekeeping comments:

1. Could you rename the file pzzlr-set-the-record-straight.html? That way, we won't run into possible merge conflicts
2. There are currently only three sample answers - the "standard" for puzzlers is to have four. Could you add one?

Also, how about the following variant that "hides" the effect a bit?

List("1", "2").toSet() + "3"

?

[edofic]

1. done
2. there are four already. compile error, runtime error, Set(1) and false.

I like the List one better too, so I changed it

[demobox]

there are four already. compile error, runtime error, Set(1) and false.

Doh! Thanks, I missed that ;-)

[nermin]

Just had couple of minor suggestions, but I like this one!

[demobox]

@nermin Thanks for the review!

[demobox]

@edofic Thanks for the cleanup! One final request: could you squash all your commits into one? Then we can merge ;-)

[edofic]

@demobox done

[demobox]

See http://scalapuzzlers.com/#pzzlr-040. Thanks, @edofic!