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MongoDB: Combine data from multiple collections into one..how?
...rrays: ["$employees", "$freelancers"] } } },
// 6. Unwind and replace root so you end up with a result set.
{ $unwind: '$union' },
{ $replaceRoot: { newRoot: '$union' } }
]);
Here is the explanation of how it works:
Instantiate an aggregate out of any collection of your database t...
What are the differences between Perl, Python, AWK and sed? [closed]
...on are fully fledged, general purpose programming languages. Perl has its roots in text processing and has a number of awk-like constructs (there is even an awk-to-perl script floating around on the net). There are many differences between Perl and Python, your best bet is probably to read the sum...
git stash blunder: git stash pop and ended up with merge conflicts
... want is to resolve the conflict using git checkout --theirs -- . from the root.
After that, you can git reset to bring all the changes from the index to the working directory, since apparently in case of conflict the changes to non-conflicted files stay in the index.
You may also want to run git ...
What is the Haskell response to Node.js?
...nfigurations plenty of pervasive magic identifiers without questioning the root of the problem: the callback model and its inherent lack of sharing of variable scopes, and no sequencing, so the sequence has to be constructed by linking identifiers.
There are sequential based frameworks like ocsigen...
How much is the overhead of smart pointers compared to normal pointers in C++?
...t can't not help at all when you pass the pointer around. This is not the root of the problems.
– Lothar
Dec 24 '17 at 5:25
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How to use git bisect?
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Make sure you're at the root of your git repo, or you'll get a weird "You need to run this command from the toplevel of the working tree." error.
– Paul Whitehead
Aug 24 '17 at 8:59
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What's the difference between using “let” and “var”?
...eady reserved in the relevant scope, otherwise it would become part of the root/host/window scope. To me personally, 'hoisting' means nothing more than reserving/linking declared 'identifiers' to their relevant scope; excluding their initialization/assignment/modifyability!
– G...
What use is find_package() if you need to specify CMAKE_MODULE_PATH anyway?
...sio Here is my example. It supports monolithic build (all modules from the root folder) or autonomous builds (each module separately, requires install).
– Dimitrios Menounos
Apr 28 '15 at 0:14
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Why Qt is misusing model/view terminology?
...upporting tree views, allows only to display all files/directories in your root directory as a list, but you cant display all files as a list. And dont say that displaying tree data as a list cant be useful. E.g., you can for example easily sort them to find the file with the greatest filesize if y...
How does lucene index documents?
...table.
Terms are generated using an analyzer which stems each word to its root form. The most popular stemming algorithm for the english language is the Porter stemming algorithm: http://tartarus.org/~martin/PorterStemmer/
When a query is issued it is processed through the same analyzer that was u...