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JRuby on Rails vs. Ruby on Rails, what's difference?
...this question, related to GIL.
The main difference you should care about esp. in web-applications such as ones built with Rails is true concurrency ("Global Interpreter Lock" free). When two threads are running (e.g. serving 2 user requests) with JRuby they are capable of running concurrently with...
Import multiple csv files into pandas and concatenate into one DataFrame
... This seems like an old fashioned aka manual way of doing things, esp. as the Hapood ecosystem has growing list of tools where you can perform sql queries directly on many different directories containing different file types (csv, json, txt, databases) as if it was one data source. There...
What is the difference between “long”, “long long”, “long int”, and “long long int” in C++?
..., and long was 32; int could either be 16 or 32. Note for some platforms (esp. the 68000) both 16-bit and 32-bit int were quite common, and indeed some compilers had options to support either. Code which needed to be portable was thus expected to use short or long in preference to int.
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How can I change the thickness of my tag
...one will test it for Chrome and IE. First two variations are quite tricky, esp. 2nd variation, which outputs visible first BLACK 1px .
– Muscaria
Nov 28 '15 at 13:59
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App Inventor 2 软件著作权（软著）申请指南 · App Inventor 2 中文网
...表一个事件、一个函数、一个条件判断等。
块的布局和连接：除了保存块本身的代码逻辑，.blk 文件还记录了这些块如何在界面上布局和连接，确保应用逻辑在界面中正确呈现和执行。
.blk 文件的特点：
图形化编程的底层...
Assign one struct to another in C
... push %ebp
401051: 89 e5 mov %esp,%ebp
401053: a1 20 20 40 00 mov 0x402020,%eax
401058: a3 30 20 40 00 mov %eax,0x402030
40105d: a1 24 20 40 00 mov 0x402024,%eax
401062: a3 34 20 40 00 mov %e...
Most efficient way to check for DBNull and then assign to a variable?
... In virtually all cases == is going to be equivalent to ReferenceEquals (esp. to DBNull) and it's much more readable. Use @Marc Gravell's optimization if you want, but I'm with him -- probably not going to help much. BTW, reference equality ought to always beat type checking.
...
Command substitution: backticks or dollar sign / paren enclosed? [duplicate]
...epeat each section of the poster's text, block-quoted, and followed by my response.
What's the preferred syntax, and why? Or are they pretty much interchangeable?
I would say that the $(some_command) form is preferred over the `some_command` form. The second form, using a pair of backquotes (t...
MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...以自动投票，选举出新的Master，并引导其余的Slave服务器连接新的Master，
而这个过程对于应用是透明的。可以说MongoDB的副本集是自带故障转移功能的主从复制。
1 相对于传统主从模式的优势
传统的主从模式，需要手工指定...
Can I change the height of an image in CSS :before/:after pseudo-elements?
...now the intrinsic dimensions of the image, and it leaves you with some whitespace, which I can't get rid of ATM.
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