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How do I iterate over an NSArray?
I'm looking for the standard idiom to iterate over an NSArray. My code needs to be suitable for OS X 10.4+.
8 Answers
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bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...tid]: This uses the thread ID as a key. There may be many reads in-flight, and we want to store a start timestamp to each. How? We could construct a unique identifier for each read, and use that as the key. But because kernel threads can only be executing one syscall at a time, we can use the thread...
Best way to define private methods for a class in Objective-C
I just started programming Objective-C and, having a background in Java, wonder how people writing Objective-C programs deal with private methods.
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How can I view all the git repositories on my machine?
...which I can see all the git repositories that exist on my machine? Any command for that?
10 Answers
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When should I use cross apply over inner join?
...NER JOIN condition.
You could probably do something like that using CTE's and window function:
WITH t2o AS
(
SELECT t2.*, ROW_NUMBER() OVER (PARTITION BY t1_id ORDER BY rank) AS rn
FROM t2
)
SELECT t1.*, t2o.*
FROM t1
INNER JOIN
t2o
ON t2o.t1...
How can Perl's print add a newline by default?
...to the beginning of your program. Or you can use Modern::Perl to get this and other features.
See perldoc feature for more details.
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Change IPython/Jupyter notebook working directory
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That worked for me on windows 10 pro. Just open CMD and type: jupyter notebook --notebook-dir="D:\change_this_path"
– TharsDimitris
Dec 14 '18 at 9:11
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What is the best way to concatenate two vectors?
I'm using multitreading and want to merge the results. For example:
8 Answers
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When should we use Observer and Observable?
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You have a concrete example of a Student and a MessageBoard. The Student registers by adding itself to the list of Observers that want to be notified when a new Message is posted to the MessageBoard. When a Message is added to the MessageBoard, it iterates over it...
Get string character by index - Java
...letter); // Prints f
If you want more information on the Character class and the toString method, I pulled my info from the documentation on Character.toString.
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