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What are the undocumented features and limitations of the Windows FINDSTR command?
...c command line help available through FINDSTR /? , or HELP FINDSTR , but it is woefully inadequate. There is a wee bit more documentation online at https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/findstr .
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Algorithm to detect corners of paper sheet in photo
...er this year. This was my first ever coding project, and kinda ended in a bit of a rush, so the code needs some errr...decoding...
I'll give a few tips from what I've seen you doing already, and then sort my code on my day off tomorrow.
First tip, OpenCV and python are awesome, move to them as soo...
NSOperation vs Grand Central Dispatch
...g GCD.
In general, you should use the highest level of abstraction that suits your needs. This means that you should usually use NSOperationQueue instead of GCD, unless you need to do something that NSOperationQueue doesn't support.
Note that NSOperationQueue isn't a "dumbed-down" version of GCD; ...
Unzipping files in Python
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import zipfile
with zipfile.ZipFile(path_to_zip_file, 'r') as zip_ref:
zip_ref.extractall(directory_to_extract_to)
That's pretty much it!
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Convert Set to List without creating new List
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You can use the List.addAll() method. It accepts a Collection as an argument, and your set is a Collection.
List<String> mainList = new ArrayList<String>();
mainList.addAll(set);
EDIT: as respond to the edit of the question.
It is easy to see that ...
The cast to value type 'Int32' failed because the materialized value is null
...nulls in different places. ...DefaultIfEmpty(0).Sum(0) can help in this (quite simple) case, where there might be no elements and sql's SUM returns null whereas c# expect 0.
A more general approach is to use ?? which will be translated to COALESCE whenever there is a risk that the generated SQL ret...
How to calculate date difference in JavaScript?
... in days, hours, minutes, seconds, milliseconds, nanoseconds. How can I do it?
18 Answers
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How to add external library in IntelliJ IDEA?
I am trying to add external library (places it in the /libs directory) to my project. When I try to use the methods from that library, I see that they are in red color which means that the library is not recognized. When I click Ctrl+B, I get a message "Cannot find declaration to go to".
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Create two blank lines in Markdown
I am adding Markdown support to my CMS editor.
15 Answers
15
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MongoDB and “joins” [duplicate]
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It's no join since the relationship will only be evaluated when needed. A join (in a SQL database) on the other hand will resolve relationships and return them as if they were a single table (you "join two tables into one").
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