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Difference between `data` and `newtype` in Haskell
...w data structure at runtime.
So the key point here is that the construct for the newtype is guaranteed to be erased at compile time.
Examples:
data Book = Book Int Int
newtype Book = Book (Int, Int)
Note how it has exactly the same representation as a (Int,Int), since the Book constru...
How to use php serialize() and unserialize()
...abases, text files, sockets. The standard PHP function serialize is just a format to express such a thing, it serializes a data structure into a string representation that's unique to PHP and can be reversed into a PHP object using unserialize. There are many other formats though, like JSON or XML.
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What is difference between cacerts and keystore?
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Hi EJP thanks for the answers, I quoted that before I read any of your answers ;) So just a clarification if I summarize your answers in Francis and Pangea. Cacerts is used to authenticate clients requesting access or connection and for ke...
How to get the root dir of the Symfony2 application?
...getBasePath();
this will work from controller action method...
EDIT:
As for the services, I think the way you did it is as clean as possible, although I would pass complete kernel service as an argument... but this will also do the trick...
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Find the max of two or more columns with pandas
... a dataframe with columns A , B . I need to create a column C such that for every record / row:
2 Answers
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How do you create optional arguments in php?
In the PHP manual, to show the syntax for functions with optional parameters, they use brackets around each set of dependent optional parameter. For example, for the date() function, the manual reads:
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Visual Studio jump to next error shortcut?
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Important: at least for VS 2017, I needed to in my "error view" have selected both "Build + Intellisense" in order for these shortcuts to work.
– Johan S
Feb 22 '18 at 10:23
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JVM option -Xss - What does it do exactly?
...ocess large structures via recursive algorithms, it may need a large stack for all those return addresses and such. With the Sun JVM, you can set that size via that parameter.
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What does |= (single pipe equal) and &=(single ampersand equal) mean
...ors, translating (very loosely)
x |= y;
into
x = x | y;
and the same for &. There's a bit more detail in a few cases regarding an implicit cast, and the target variable is only evaluated once, but that's basically the gist of it.
In terms of the non-compound operators, & is a bitwise ...
Test if a class has an attribute?
...nly check if the attribute is present, which is usually all that is needed for parameterless/propertyless attributes, it's cheaper to use .IsDefined, as it will query the metadata, and not deserialize and instantiate the attribute object.
– Lasse V. Karlsen
Aug...