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What are all the uses of an underscore in Scala?
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The ones I can think of are
Existential types
def foo(l: List[Option[_]]) = ...
Higher kinded type parameters
case class A[K[_],T](a: K[T])
Ignored variables
val _ = 5
Ignored parameters
List(1, 2, 3) foreach { _ =>...
How do I tell Matplotlib to create a second (new) plot, then later plot on the old one?
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But how can one change the label and axis limits with this approach. If I use ax1.ylabel it says that it is not found. Same with fig1.ylabel ...
– George Datseris
Aug 28 '16 at 7:45
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How can I do a case insensitive string comparison?
... string is better practice than String since it is a language keyword. For one, String could be something other than System.String, whereas string cannot be. Also, string is more or less guaranteed to exist in C#, whereas String is technically part of .NET rather than C#.
– Dav...
What would cause an algorithm to have O(log n) complexity?
...imes can you divide n by two before you get a number less than or equal to one? For 16, we have that
16 / 2 = 8
8 / 2 = 4
4 / 2 = 2
2 / 2 = 1
Notice that this ends up taking four steps to complete. Interestingly, we also have that log2 16 = 4. Hmmm... what about 128?
128 / 2 = 64
64 / 2 ...
GroupBy pandas DataFrame and select most common value
I have a data frame with three string columns. I know that the only one value in the 3rd column is valid for every combination of the first two. To clean the data I have to group by data frame by first two columns and select most common value of the third column for each combination.
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Switching the order of block elements with CSS [duplicate]
Let's say my HTML is already set in stone:
11 Answers
11
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Does const mean thread-safe in C++11?
... to say on thread-safety:
[1.10/4]
Two expression evaluations conflict if one of them modifies a memory location (1.7) and the other one accesses or modifies the same memory location.
[1.10/21]
The execution of a program contains a data race if it contains two conflicting actions in different threa...
Python: split a list based on a condition?
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@dansalmo Especially since you can make it a one-liner with the for-cycle, and if you wanted to append something more complicated than x, you can make it into one append only: for x in mylist: (good if isgood(x) else bad).append(x)
– yo'
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jQueryUI Tooltips are competing with Twitter Bootstrap
...me and is the easiest way. I recommend adding an HTML comment stating that one library has to be loaded after the other.
– Paul
Jun 27 '15 at 14:37
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Can I recover a branch after its deletion in Git?
...to recreate the branch from there.
Credit to @Cascabel for this condensed/one-liner version.
You can do it in one step:
git checkout -b <branch> <sha>
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