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Check that Field Exists with MongoDB
So I'm attempting to find all records who have a field set and isn't null.
4 Answers
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How to install ia32-libs in Ubuntu 14.04 LTS (Trusty Tahr)
I installed Ubuntu 14.04 (Trusty Tahr) yesterday. Everything seems OK. But when I tried to compile some C code, I encounter the following error. The error seems to be due to the OS lacking the 32-bit architecture support. The error output is as following:
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What is the difference between Scala's case class and class?
...xclusively depend on their constructor arguments.
This functional concept allows us to
use a compact initialization syntax (Node(1, Leaf(2), None)))
decompose them using pattern matching
have equality comparisons implicitly defined
In combination with inheritance, case classes are used to mimi...
Http Basic Authentication in Java using HttpClient?
...the builder while build the httpclient. Also I like it because it is per call scope. Not on the whole httpclient scope.
– Tony
Aug 15 '19 at 16:23
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Iterating C++ vector from the end to the beginning
...;
i != my_vector.rend(); ++i ) {
}
rbegin()/rend() were especially designed for that purpose. (And yes, incrementing a reverse_interator moves it backward.)
Now, in theory, your method (using begin()/end() & --i) would work, std::vector's iterator being bidirectional, but remember,...
How to trigger the onclick event of a marker on a Google Maps V3?
...anks to Firebug ;)
//"markers" is an array that I declared which contains all the marker of the map
//"i" is the index of the marker in the array that I want to trigger the OnClick event
//V2 version is:
GEvent.trigger(markers[i], 'click');
//V3 version is:
google.maps.event.trigger(markers[i], '...
Java: Get month Integer from Date
...o the reader: You may want to specify a time zone rather than rely on the call for default shown in the Answer. A new day (and month) dawns earlier in Paris, for example, than Montréal. If you care specifically about Montréal, the use ZoneId.of( "America/Montreal" ).
– Basil ...
“Rate This App”-link in Google Play store app on the phone
...constant was deprecated in API level 21. As of API 21 this performs identically to FLAG_ACTIVITY_NEW_DOCUMENT which should be used instead of this.
– xnagyg
Aug 27 '15 at 12:58
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How can I detect the encoding/codepage of a text file
...itively Must Know About Unicode and Character Sets (No Excuses!).
Specifically Joel says:
The Single Most Important Fact About Encodings
If you completely forget everything I just explained, please remember one extremely important fact. It does not make sense to have a string without knowi...
Multiple Inheritance in PHP
...tMessage class, and sending algorithm is delegated to dispatcher. This is called Strategy Pattern, you can read more on it here.
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