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what is the difference between a portlet and a servlet?
... servlet is
managed by servlet container.
Both static and dynamic content can be generated by Portlets and
Servlets.
The life cycle of portlets and servlets is controlled by the container
The client/server model is used for both servlets and portlets
The packaging and deployment are essentially ...
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
When using summarise with plyr 's ddply function, empty categories are dropped by default. You can change this behavior by adding .drop = FALSE . However, this doesn't work when using summarise with dplyr . Is there another way to keep empty categories in the result?
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Boolean operators && and ||
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The shorter ones are vectorized, meaning they can return a vector, like this:
((-2:2) >= 0) & ((-2:2) <= 0)
# [1] FALSE FALSE TRUE FALSE FALSE
The longer form evaluates left to right examining only the first element of each vector, so the above gives
((-2...
Difference between Pragma and Cache-Control headers?
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Pragma is the HTTP/1.0 implementation and cache-control is the HTTP/1.1 implementation of the same concept. They both are meant to prevent the client from caching the response. Older clients may not support HTTP/1.1 which is why that header is still in use.
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Using -performSelector: vs. just calling the method
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Basically performSelector allows you to dynamically determine which selector to call a selector on the given object. In other words the selector need not be determined before runtime.
Thus even though these are equivalent:
[...
Is it bad practice to have a constructor function return a Promise?
...should go in a method of your class. You want to mutate global state? Then call that procedure explicitly, not as a side effect of generating an object. This call can go right after the instantiation:
var engine = new Engine()
engine.displayPosts();
If that task is asynchronous, you can now easil...
Do you have to put Task.Run in a method to make it async?
...nology: "asynchronous" (async) means that it may yield control back to the calling thread before it starts. In an async method, those "yield" points are await expressions.
This is very different than the term "asynchronous", as (mis)used by the MSDN documentation for years to mean "executes on a ba...
Difference between Grunt, NPM and Bower ( package.json vs bower.json )
... if it's late 2017 this answer might not be up to date anymore!
Beginners can quickly get lost in choice of build tools and workflows, but what's most up to date in 2016 is not using Bower, Grunt or Gulp at all! With help of Webpack you can do everything directly in NPM!
Google "npm as build tool...
Why XML-Serializable class need a parameterless constructor
...d fields and properties only after acquiring an instance to populate.
You can make your constructor private or internal if you want, just so long as it's parameterless.
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What is the recommended approach towards multi-tenant databases in MongoDB?
...in terms of how many tenants I'd have yet, but I would like to be able to scale into the thousands.
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