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What is a Manifest in Scala and when do you need it?
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The compiler knows more information about types than the JVM runtime can easily represent. A Manifest is a way for the compiler to send an inter-dimensional message to the code at runtime about the type information that was lost.
This is similar to ...
What is Node.js' Connect, Express and “middleware”?
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The accepted answer is really old (and now wrong). Here's the information (with source) based on the current version of Connect (3.0) / Express (4.0).
What Node.js comes with
http / https createServer which simply takes a callback(req,res) e.g.
var server = http.createServer(function ...
Accessing last x characters of a string in Bash
...: -3}
or
${string:(-3)}
(mind the space between : and -3 in the first form).
Please refer to the Shell Parameter Expansion in the reference manual:
${parameter:offset}
${parameter:offset:length}
Expands to up to length characters of parameter starting at the character
specified by offset. If...
When should I use Arrow functions in ECMAScript 6?
...uctor(name) {
this.name = name;
}
}
I expect that use of the former notation will eventually be discouraged. The object constructor notation may still be used by some for simple anonymous object factories where objects are programmatically generated, but not for much else.
Where an ob...
Reference - What does this error mean in PHP?
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Warning: Cannot modify header information - headers already sent
Happens when your script tries to send an HTTP header to the client but there already was output before, which resulted in headers to be already sent to the client.
This is an E_WARNING and ...
What exactly is RESTful programming?
...STful.
Keep in mind that GET requests should never be used for updating information. For example, a GET request for adding an item to a cart
http://myserver.com/addToCart?cart=314159&item=1729
would not be appropriate. GET requests should be idempotent. That is, issuing a request twice shoul...
What kind of virtual machine is BEAM (the Erlang VM)?
...guage. The programs are usually presented to the virtual machine in source form of the guest language, without being fully compiled into machine code beforehand. The runtime engine needs to interpret or translate the program and also fulfill certain functionalities that are abstracted by the languag...
ruby on rails f.select options with custom attributes
I have a form select statement, like this:
5 Answers
5
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What does it mean to “program to an interface”?
...ava or C#, we already have inheritance and I viewed interfaces as a weaker form of inheritance and thought, "why bother?" In a sense I was right, you can think of interfaces as sort of a weak form of inheritance, but beyond that I finally understood their use as a language construct by thinking of ...
MFC Grid control 2.27 - C/C++ - 清泛网 - 专注IT技能提升
...new features, fixing new bugs and beating the code by force of will into a form that is as feature rich and useable as something of this form can be. Dozens of developers from all over the world have contributed fixes, improvements and suggestions over the 4 years that the grid has been growing, and...