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How does push notification technology work on Android?
...e Android system looks at the message to determine which app it's for, and starts that app. The app must have registered with Android to use GCM, and it must have the relevant permission. When the app starts, it might create a notification straight away with the data from the message. GCM messages a...
Differences between Perl and PHP [closed]
... be used for the same affect.
In Perl, // is an operator. In PHP, it's the start of a one-line comment.
Until PHP 5.3, PHP had terrible support for anonymous functions (the create_function function) and no support for closures.
PHP had nothing like Perl's packages until version 5.3, which introduced...
How does MySQL process ORDER BY and LIMIT in a query?
...ndex to get the 20 records requested - the 20 records will be found at the start of the index. But if there is no suitable index, then a full scan of the table will be needed.
There is a MySQL Performance Blog article from 2009 on this.
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NodeJS / Express: what is “app.use”?
...e method is defined as part of Connect that Express is based upon.
Update Starting with version 4.x, Express no longer depends on Connect.
The middleware functions that were previously included with Express are now in separate modules; see the list of middleware functions.
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Efficiently test if a port is open on Linux?
...your use case, such as sending an email, exiting the script on failure, or starting the required service.
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Add new item in existing array in c#.net
...witem,1)).ToArray();
And if you are sure that the array is never null to start with, you can simplify it to:
arr.Concat(Enumerable.Repeat(newitem,1)).ToArray();
Notice that if you want to add items to a an ordered collection, List is probably the data structure you want, not an array to start w...
Strangest language feature
...pointer arithmetic (and since a is a short, in your example, a + 10 means 'start at a's address, and move 10 shorts, i.e. 20 bytes'). The expression 10[a] is interepreted as "* (10+a)", where "10+a" is also pointer arithmetic, and is treated exactly the same way.
– Edan Maor
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Why is Visual Studio 2013 very slow?
... After upgrading to VS2013 my pages especially with javascript started to load very slow. Turning off Browser Link feature solved this problem and now my web pages load fast again. Thanks a lot!
– cck
Jun 18 '14 at 13:48
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ASP.NET MVC Conditional validation
...at it can do client side validation (I put it in global.asax, Application_Start)
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(RequiredIfAttribute),typeof(RequiredAttributeAdapter));
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Catch All Bugs with BugTrap! - 开源 & Github - 清泛网 - 专注IT技能提升
...didn't have any server. In spite of these limitations, it was an excellent starting point because I knew exactly what kind of a tool I wanted. I started working on my own tool in the hope of making it flexible and customizable, and a powerful solution.
Overview
Usually, it's very frustrating to re...