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What does middleware and app.use actually mean in Expressjs?
...atement for middleware but I haven't found a clear, concise explanation of what middleware actually is and what the app.use statement is doing. Even the express docs themselves are a bit vague on this. Can you explain these concepts for me please?
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In CSS what is the difference between “.” and “#” when declaring a set of styles?
What is the difference between # and . when declaring a set of styles for an element and what are the semantics that come into play when deciding which one to use?
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What are the differences between a pointer variable and a reference variable in C++?
...safe to think of a reference as another name for the same variable. Note: What a pointer points to can be on the stack or heap. Ditto a reference. My claim in this statement is not that a pointer must point to the stack. A pointer is just a variable that holds a memory address. This variable is ...
What does the unary plus operator do?
What does the unary plus operator do? There are several definitions that I have found ( here and here ) but I still have no idea what it would be used for. It seems like it doesn't do anything but there has be a reason for it, right?
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What does “coalgebra” mean in the context of programming?
...res which is pretty much incomprehensible to me. Can anyone please explain what coalgebras mean in the context of programming, what is their significance, and how they relate to objects and comonads?
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How do I find out what version of WordPress is running?
I have just taken over someone's hosted WordPress site. How do I find out what version he is running?
16 Answers
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What is Eclipse's Ctrl+O (Show Outline) shortcut equivalent in IntelliJ IDEA?
...familiar with the behaviour you're after - but I believe Ctrl + F12 may do what you want: it is the shortcut for the File structure Popup in the default mapping.
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What is the difference between DAO and Repository patterns?
What is the difference between Data Access Objects (DAO) and Repository patterns? I am developing an application using Enterprise Java Beans (EJB3), Hibernate ORM as infrastructure, and Domain-Driven Design (DDD) and Test-Driven Development (TDD) as design techniques.
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What's the fastest way to merge/join data.frames in R?
...hmark results are below. Please see revision history of this answer to see what changed.
test replications elapsed relative user.self sys.self
4 data.tableBest 1 0.532 1.000000 0.488 0.020
7 sqldf 1 2.059 3.870301 2.041 0.008
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