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Rails DB Migration - How To Drop a Table?
...tp://api.rubyonrails.org/classes/ActiveRecord/Migration.html
More specifically, you can see how to drop a table using the following approach:
drop_table :table_name
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How to convert Set to String[]?
...'s recommended. Update the answer. "Since late updates of OpenJDK 6 this call was intrinsified, making the performance of the empty array version the same and sometimes even better, compared to the pre-sized version. Also passing pre-sized array is dangerous for a concurrent or synchronized collect...
How to get existing fragments when using FragmentPagerAdapter
...agerAdapter , as a helper class that implements the management of tabs and all details of connecting a ViewPager with associated TabHost . I have implemented FragmentPagerAdapter just as same as it is provided by the Android sample project Support4Demos .
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What is the explicit promise construction antipattern and how do I avoid it?
...){
return myPromiseFn(param+1); // much nicer, right?
}
Promises are all about making asynchronous code more readable and behave like synchronous code without hiding that fact. Promises represent an abstraction over a value of one time operation, they abstract the notion of a statement or expr...
Allow multiple roles to access controller action
Right now I decorate a method like this to allow "members" to access my controller action
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Is there a JSON equivalent of XQuery/XPath?
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Yup, it's called JSONPath. The source is now on GitHub.
It's also integrated into DOJO.
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How to break out of nested loops?
...ested loops:
use goto
use flags
factor out loops into separate function calls
Couldn't resist including xkcd here :)
source
Goto's are considered harmful but as many people in the comments suggest it need not be. If used judiciously it can be a great tool. Anything used in moderation is fun....
How to increment a pointer address and pointer's value?
...ou're incrementing it as if you were iterating in an array.
So, to sum it all up:
ptr++; // Pointer moves to the next int position (as if it was an array)
++ptr; // Pointer moves to the next int position (as if it was an array)
++*ptr; // The value of ptr is incremented
++(*ptr); // The va...
In Java, is there a way to write a string literal without having to escape quotes?
...ing literal with a lot of quotation marks inside it. You could escape them all, but it's a pain, and difficult to read.
8 A...
How to determine if a type implements an interface with C# reflection
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@PierreArnaud: IsAssignableFrom does eventually calls GetInterfaces, so probably your test checked the GetInterfaces first and IsAssignable after. That is because GetInterfaces caches it's results so the first invocation costs more
– Panos Theof
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