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What does the (unary) * operator do in this Ruby code?
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The * is the splat operator.
It expands an Array into a list of arguments, in this case a list of arguments to the Hash.[] method. (To be more precise, it expands any object that responds to to_ary/to_a, or to_a in Ruby 1.9.)
To illustrate, the following two ...
What is the purpose of “!” and “?” at the end of method names?
Sometimes I see methods in Ruby that have "?" and "!" at the end of them, e.g:
5 Answers
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Programmatically set height on LayoutParams as density-independent pixels
...? It looks like the height/width, when set programmatically, are in pixels and not dp.
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How to commit changes to a new branch
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You can do a git status to see what is currently staged and what is not.
– John Brodie
Feb 1 '13 at 22:20
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Init method in Spring Controller (annotation version)
... the initialization process in Spring. If you have to initialize all beans and autowire/inject them there are at least two ways that I know of that will ensure this. I have only testet the second one but I belive both work the same.
If you are using @Bean you can reference by initMethod, like this...
jQuery - selecting elements from inside a element
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It's worth noting that .children() and .find() are similar except that the former travels only one level down the DOM sub-tree.
– Kevin
May 26 '16 at 3:13
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Select distinct values from a table field
...uery, not even the default ordering, call order_by() with no parameters.
and distinct() in the note where it discusses issues with using distinct() with ordering.
To query your DB, you just have to call:
models.Shop.objects.order_by().values('city').distinct()
It returns a dictionnary
or
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Is a RelativeLayout more expensive than a LinearLayout?
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In a talk at Google I/O 2013 (Writing Custom Views for Android), Romain Guy clarified the misunderstanding that caused everyone to start using RelativeLayouts for everything. A RelativeLayout always has to do two measure passes. Overall it is negligible as long as your view hiera...
Having a private branch of a public repo on GitHub?
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You can bring in changes to your public repo using 'git fetch public' and then merge them locally and push to your private repo (origin remote).
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On localhost, how do I pick a free port number?
I'm trying to play with inter-process communication and since I could not figure out how to use named pipes under Windows I thought I'll use network sockets. Everything happens locally. The server is able to launch slaves in a separate process and listens on some port. The slaves do their work and s...