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Get ID of last inserted document in a mongoDB w/ Java driver
Is there an easy way to get the ID (ObjectID) of the last inserted document of a mongoDB instance using the Java driver?
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Can a class member function template be virtual?
I have heard that C++ class member function templates can't be virtual. Is this true?
12 Answers
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Why should I prefer to use member initialization lists?
I'm partial to using member initialization lists with my constructors... but I've long since forgotten the reasons behind this...
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Summarizing multiple columns with dplyr? [duplicate]
I'm struggling a bit with the dplyr-syntax. I have a data frame with different variables and one grouping variable. Now I want to calculate the mean for each column within each group, using dplyr in R.
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What is the proper way to check for null values?
I love the null-coalescing operator because it makes it easy to assign a default value for nullable types.
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What's the meaning of interface{}?
I'm new to interfaces and trying to do SOAP request by github
6 Answers
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Ruby's ||= (or equals) in JavaScript?
...s efficient than the standard javascript idiom a = a || b.
For reference:
http://www.rubyinside.com/what-rubys-double-pipe-or-equals-really-does-5488.html
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What jsf component can render a div tag?
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In JSF 2.2 it's possible to use passthrough elements:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:jsf="http://xmlns.jcp.org/jsf">
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<div jsf:id="id1" />
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</html>
The requirement is to have at least one attribute in the element using jsf namespace.
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CSS center display inline block?
I have a working code here: http://jsfiddle.net/WVm5d/ (you might need to make the result window bigger to see the align center effect)
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The difference between the Runnable and Callable interfaces in Java
What is the difference between using the Runnable and Callable interfaces when designing a concurrent thread in Java, why would you choose one over the other?
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