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Chris Seaton The Ruby flip-flop operator is an example of a very obscure part of Ruby. Probably few people have heard of it. It’s not covered in any book I’ve read and it doesn’t even appear to be mentioned in the old ISO standard. Briefly, it’s a form of if with two conditions, using syntax that looks like a range literal. It’s usually run in some kind of loop. The body is not executed until the first condition becomes true, and then it is executed again until the second condition becomes true, at which point it the body is not executed again. You can use it to count the number of days between Tuesday and Thursday, for example. DAYS = [ :mon , :tue , :wed , :thur , :fri , :sat , :sun ] count = 0 DAYS . each do | day | if day == :tue . . day == :thur count += 1 end end The name ‘flip-flop’ comes from the electrical component that has a similar func...

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This is a dumb hack, we should only have one or the other from the the template context, so only one of the following will be rendered. ...

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This is a dumb hack, we should only have one or the other from the the template context, so only one of the following will be rendered. ...

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