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What is a “symbol” in Julia?
...cifically:
I am trying to use Julia's DataFrames package, specifically the readtable() function with the names option, but that requires a vector of symbols.
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How to pass a class type as a function parameter
...ng?
var regionName: String?
// Nothing to change here, CityInfo already implements init()
}
Then you only have to change the generic constraints of invokeService from <T> to <T: Initable>.
Tip
If you get strange errors like "Cannot convert the expression's type '()' to type ...
What do single quotes do in C++ when used on multiple characters?
...y on the same platform will never fail. These enum'd values are easier to read and they actually contain their identity in their value, which is pretty nice.
What I've tried to do below is wrap a multibyte character literal up so it can be printed (on Mac this works). The strange thing is, if you...
How do I check for null values in JavaScript?
...
Readers, please be careful when using this type of test on numeric data. Do not use ! or !! to test for null or undefined on typically-numeric data unless you also want to throw away values of 0.
– Nick...
pandas: How do I split text in a column into multiple rows?
...ace would be to dump the DataFrame to a file, and then open it as csv with read_csv(..., sep=' '). But to stay on topic: the first solution (together with the third, which however should be awfully slow) may be the one offering you the lowest memory usage among the 4, since you have a relatively sma...
Is it possible to make abstract classes in Python?
... what does the @abstractmethod do? Why do you need it? If the class is already established as abstract shouldn't the compiler/interpret know that all the methods are from the abstract class in question?
– Charlie Parker
Mar 17 '14 at 3:30
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What are the use(s) for tags in Go?
...rent structs and best way to get familiar with the tags a package needs is READING A PACKAGE DOCUMENTATION COMPLETELY.
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Is 'float a = 3.0;' a correct statement?
...f either of those values. Otherwise,
the behavior is undefined.
We can read more details on the implications of this in GotW #67: double or nothing which says:
This means that a double constant can be implicitly (i.e., silently)
converted to a float constant, even if doing so loses precisi...
Get local IP address
...it harsh. If you have VMWare or multiple NICs, some of the other answers already provide clues to that.
– Mrchief
May 31 '16 at 17:32
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What are the First and Second Level caches in Hibernate?
...he entire application, not bound to single user. Since
the objects are already loaded in the cache, whenever an object is
returned by the query, at that time no need to go for a database
transaction. In this way the second level cache works. Here we can use
query level cache also.
Quoted f...