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Ruby, Difference between exec, system and %x() or Backticks
What is the difference between the following Ruby methods?
3 Answers
3
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Resuming git-svn clone
I started cloning an SVN repository using the git-svn's clone operation. After about 6 hours of importing (it's a big repo), my computer went and slept on me. Is there a way to resume the operation without redoing all of the initial work?
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Bare asterisk in function arguments?
What does a bare asterisk in the arguments of a function do?
6 Answers
6
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How to create a file in memory for user to download, but not through server?
Is there any way I can create a text file on the client side and prompt the user to download it, without any interaction with the server?
I know I can't write directly to their machine (security and all), but can I create and prompt them to save it?
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How do Google+ +1 widgets break out of their iframe?
Somehow, hovering over a Google+ plus-one widget can introduce a tooltip-type deal that is clearly larger than the <iframe> element in which it is contained. I’ve inspected the DOM to confirm this.*
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What are “sugar”, “desugar” terms in context of Java 8?
I hear about 'sugaring' and 'desugaring' more often in Java 8, what does these terms mean ? are they conceptual or syntactical.
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What is the difference between class and instance attributes?
Is there any meaningful distinction between:
5 Answers
5
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Is it possible to do start iterating from an element other than the first using foreach?
I'm thinking about implementing IEnumerable for my custom collection (a tree) so I can use foreach to traverse my tree. However as far as I know foreach always starts from the first element of the collection. I would like to choose from which element foreach starts. Is it possible to somehow chang...
MySQL ON vs USING?
In a MySQL JOIN , what is the difference between ON and USING() ? As far as I can tell, USING() is just more convenient syntax, whereas ON allows a little more flexibility when the column names are not identical. However, that difference is so minor, you'd think they'd just do away with USI...
Does a UNIQUE constraint automatically create an INDEX on the field(s)?
Should I define a separate index on the email column (for searching purposes), or is the index is "automatically" added along with UNIQ_EMAIL_USER constraint?
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