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WebSockets vs. Server-Sent events/EventSource
...yfilled into older browsers that do not support it natively using just JavaScript. Some implementations of SSE polyfills can be found on the Modernizr github page.
Gotchas:
SSE suffers from a limitation to the maximum number of open connections, which can be specially painful when opening various...
How do I see a C/C++ source file after preprocessing in Visual Studio?
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For C++ code, it's actually a lot harder. For GCC/g++, I found this Perl script useful.
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How do I check if file exists in jQuery or pure JavaScript?
How do I check if a file on my server exists in jQuery or pure JavaScript?
17 Answers
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When should I use uuid.uuid1() vs. uuid.uuid4() in python?
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My team just ran into trouble using UUID1 for a database upgrade script where we generated ~120k UUIDs within a couple of minutes. The UUID collision led to violation of a primary key constraint.
We've upgraded 100s of servers but on our Amazon EC2 instances we ran into this issue a few t...
When to use IMG vs. CSS background-image?
...er {
background-image:url(image_2.jpg);
}
This saves any kind of JavaScript or jQuery animation to fade an <img/>'s src.
More information about transitions on MDN.
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Java compile speed vs Scala compile speed
...la seems to consume a lot of time. I hear that with many large projects a scripting language becomes very important because of the time compiling takes, a need that I didn't see arising when I was using Java.
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What do the python file extensions, .pyc .pyd .pyo stand for?
...c’ or ‘.pyo’ files is the speed with which they are loaded.
When a script is run by giving its name on the command line, the bytecode for the script is never written to a ‘.pyc’ or ‘.pyo’ file. Thus, the startup time of a script may be reduced by moving most of its code to a module a...
Apache Prefork vs Worker MPM
...d into the server by using the argument --with-mpm=NAME with the configure script where NAME is the name of the desired MPM.
Apache will use a default MPM for each operating system unless a different one is choosen at compile-time (for instance on Windows mpm_winnt is used by default). Here's the l...
MediaNotification 媒体通知扩展：管理媒体播放器通知，支持播放控制 · Ap...
...API级别21（LolliPop 5.0）以来，有一种特殊类型的通知专门开发用于控制媒体播放器。外部播放设备如耳机也可以通过此通知控制媒体播放器。
此扩展仅用于管理媒体通知。如果要创建常规通知，应使用 UrsAI2Notifier 扩展。
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What are all the valid self-closing elements in XHTML (as implemented by the major browsers)?
...i, IE9) supports self-closing syntax on every element.
<div/>, <script/>, <br></br> all should work just fine. If they don't, then you have HTML with inappropriately added XHTML DOCTYPE.
DOCTYPE does not change how document is interpreted. Only MIME type does.
W3C decisi...