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Hidden features of Scala
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trait Functor[F[_]] {
def fmap[A, B](f: A => B, fa: F[A]): F[B]
}
Now, if you have a Functor[List], you can map over lists. If you have a Functor[Tree], you can map over trees. But more importantly, if you have Functor[A] for any A of kind (*->*), you can map a function over A.
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Xcode 4 hangs at “Attaching to (app name)”
...or or iOS device. It was working perfectly in Xcode 3, but all of a sudden now when I press run the program stops at "Attaching to...". There doesn't seem to be any other info to help with this problem either.
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When would anyone use a union? Is it a remnant from the C-only days?
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Great! In that case, I'm now wondering why the Sdl function wasn't just implemented as a class hierarchy. Is that to make it C compatible and not just C++?
– Russel
Jan 25 '11 at 12:42
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TFS: How can you Undo Checkout of Unmodified files in a batch file
... The majority of these files are not modified, but the generator does not know this ahead of time.
10 Answers
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What is the `sensor` parameter for in the Google Places API?
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Edit: The sensor parameter is no longer required, and will now be ignored if it's used.
The parameter doesn't impact the results. It's a parameter that Google is required to collect for Google's data providers who charge differently based on whether the request uses a sensor or not....
Jenkins / Hudson environment variables
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I kept running into this problem, but now I just add:
source /etc/profile
As the first step in my build process. Now all my subsequent rules are loaded for Jenkins to operate smoothly.
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“Incorrect string value” when trying to insert UTF-8 into MySQL via JDBC?
... still not write international text into db getting same failure as above
Now using this how-to-convert-an-entire-mysql-database-characterset-and-collation-to-utf-8
Update all your db to use utf8mb4
ALTER DATABASE YOURDB CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
Run this query that giv...
Splitting a string into chunks of a certain size
...meone that just wants to look at a solution to this problem. A person must now understand what the Enumerable.Range() and .Select() functions do. I will not argue that you should have an understanding of that to write C#/.NET code as these functions have been in the BCL for many years now.
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NumPy or Pandas: Keeping array type as integer while having a NaN value
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For now you have to specify a special dtype like 'Int64' to make it work. It will be even better when it will be enabled by default.
– Jean Paul
Jan 23 '19 at 13:42
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Add new methods to a resource controller in Laravel
I want to know if it is possible to add new methods to a resource controller in Laravel and how you do it.
9 Answers
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