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What is so bad about singletons? [closed]

.... I still use quite a lot of singletons, especially for factory classes , and while you have to be a bit careful about multithreading issues (like any class actually), I fail to see why they are so awful. ...
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Do Git tags only apply to the current branch?

...st recent commit of the branch you are currently on. You can change branch and create a tag there. You can also just refer to the other branch while tagging, git tag v1.0 name_of_other_branch which will create the tag to the most recent commit of the other branch. Or you can just put the tag an...
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Concatenating two lists - difference between '+=' and extend()

... Maybe the difference has more implications when it comes to ducktyping and if your maybe-not-really-a-list-but-like-a-list supports .__iadd__()/.__add__()/.__radd__() versus .extend() – Nick T Dec 15 '14 at 22:21 ...
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Get element at specified position - JavaScript

...lly I'm looking to write a function that takes two input parameters (the x and y coordinates) and returns the html element at the position on the screen represented by the parameters. ...
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Instance variable: self vs @

... I have once read a book in rails and don't understand the difference between this self and @, so I should always use self.var_name in my methods (that doesn't setter and getter) to make my data using public interface, I spent time defining it in getter and s...
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Is there a HTML opposite to ?

... Not allowed in the xhtml standard at least. – Dykam Aug 4 '09 at 19:56 29 ...
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How to call any method asynchronously in c#

...ibrary in .Net 4. It's much, much nicer than using BeginInvoke/EndInvoke, and gives a clean way to fire-and-forget for async jobs: using System.Threading.Tasks; ... void Foo(){} ... new Task(Foo).Start(); If you have methods to call that take parameters, you can use a lambda to simplify the call...
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Bootstrap right Column on top on mobile view

... to accomplish this. col-md-push-6 will "push" the column to the right 6 and col-md-pull-6 will "pull" the column to the left on "md" or greater view-ports. On any smaller view-ports the columns will be in normal order again. I think what throws people off, is that you have to put B above A in yo...
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Method Resolution Order (MRO) in new-style classes?

...lasses to demonstrate how methods are resolved in classic resolution order and how is it different with the new order. 4...
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Update built-in vim on Mac OS X

...his line to your .bashrc or .profile: alias vim='/path/to/your/own/vim' and/or change your $PATH so that it looks into its location before the default location. The best thing to do, in my opinion, is to simply download the latest MacVim which comes with a very complete vim executable and use it...