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How to skip over an element in .map()?
... With all these negative, "empty"-style values (null, undefined, NaN etc) it would be good if we could utilise one inside a map() as an indicator that this object maps to nothing and should be skipped. I often come across arrays I want to map 98% of (eg: String.split() leaving a single, empty...
What is the difference between #import and #include in Objective-C?
...PILED_HEADER_SHARING, GCC_PRECOMPILE_PREFIX_HEADER, and GCC_PREFIX_HEADER, etc.
Also, while not well-documented… You can create module.maps for your own frameworks and include them in the same convenient fashion. You can take a look at my ObjC-Clang-Modules github repo for some examples of how t...
What is the difference between 0.0.0.0, 127.0.0.1 and localhost?
... normally the hostname for the 127.0.0.1 IP address. It's usually set in /etc/hosts (or the Windows equivalent named "hosts" somewhere under %WINDIR%). You can use it just like any other hostname - try "ping localhost" to see how it resolves to 127.0.0.1.
0.0.0.0 has a couple of different meanings...
How do I perform the SQL Join equivalent in MongoDB?
... is small. It is going to bring each book content to your client and then fetch each category, lending and authors one by one. The moment your books are in thousands, this would go really really slow. A better technique probably would be to use aggregation pipeline and output the merged data into a...
In Python, how do I use urllib to see if a website is 404 or 200?
...
The getcode() method (Added in python2.6) returns the HTTP status code that was sent with the response, or None if the URL is no HTTP URL.
>>> a=urllib.urlopen('http://www.google.com/asdfsf')
>>> a.getcode()
404...
How can I access Google Sheet spreadsheets only with Javascript?
...nt to access Google Spreadsheets using JavaScript only (no .NET, C#, Java, etc.)
12 Answers
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Tree data structure in C#
...siness logic that must be implemented (child limits, sorting the children, etc.)
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pinpointing “conditional jump or move depends on uninitialized value(s)” valgrind message
...ed in C all the time (examples: padding in structures, the realloc() call, etc.) so those warnings would not be very useful due to the false positive frequency.
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Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...in L2 (i.e when you access matice2[0, 0], matice2[1, 0], matice2[2, 0] ... etc, nothing gets evicted) than there is no problem with cache misses with matice2 either.
Now to go deeper in how caches works, if byte address of your variable is X, than the cache line for it would be (X >> 6) &...
How do you sort a list in Jinja2?
...jects, then you can define the various comparison methods (__lt__, __gt__, etc.) for the class of those objects.
If movie_list is a list of tuples or lists, the rating must be first. Or you'll have to do the sorting outside Jinja2.
If movie_list is a list of dictionaries, then you can use dictsor...