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What is the difference between a weak reference and an unowned reference?
...a.k.a. they don't increase the retain count in order to prevent ARC from deallocating the referred object).
But why two keywords? This distinction has to do with the fact that Optional types are built-in the Swift language. Long story short about them: optional types offer memory safety (this works ...
How to check if a line is blank using regex
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Actually in multiline mode a more correct answer is this:
/((\r\n|\n|\r)$)|(^(\r\n|\n|\r))|^\s*$/gm
The accepted answer: ^\s*$ does not match a scenario when the last line is blank (in multiline mode).
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Delete forked repo from GitHub
... git and GitHub and there's a project I'm watching on GitHub. I unintentionally clicked to fork it. Now it appears as a new project to me.
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Block comments in html.erb templates in rails
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=begin I think the begin - end would be all =end # You may ignore my comment as its entirely commented :P
– Garfield
Jun 27 '10 at 17:45
3
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How do you open an SDF file (SQL Server Compact Edition)? [closed]
... and query it with some UI. How can I do this? I have no Visual Studio installed on the machine and I would like to install as little software as possible.
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How can I avoid Java code in JSP files, using JSP 2?
...ance/composition.
Debuggability: if scriptlet throws an exception halfway, all you get is a blank page.
Testability: scriptlets are not unit-testable.
Maintainability: per saldo more time is needed to maintain mingled/cluttered/duplicated code logic.
Sun Oracle itself also recommends in the JSP co...
Regex group capture in R with multiple capture-groups
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and str_match_all() to match all groups in a regex
– smci
Mar 26 '14 at 15:49
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To switch from vertical split to horizontal split fast in Vim
...g list says (re-formatted for better readability):
To change two vertically split
windows to horizonally split
Ctrl-w t Ctrl-w K
Horizontally to vertically:
Ctrl-w t Ctrl-w H
Explanations:
Ctrl-w t makes the first (topleft) window current
Ctrl-w K moves th...
Convert a python dict to a string and back
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You should add a simple example to allow users see how to do that.
– Miguel Vazq
Sep 23 '15 at 11:01
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Using the “start” command with parameters passed to the started program
...iles\Microsoft Virtual PC\Virtual PC.exe" -pc "MY-PC" -launch
and you're all set. Since you're not starting up a command prompt to launch it, there will be no DOS Box.
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