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Count number of records returned by group by
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Impossible to Install PG gem on my mac with Mavericks
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253
If you want to avoid using MacPorts, you can download the Postgres App and place it into the App...
TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...这只是一个采样，不能代表普遍情况。
经典算法
RFC793 中定义的经典算法是这样的：
1）首先，先采样RTT，记下最近好几次的RTT值。
2）然后做平滑计算SRTT（ Smoothed RTT）。公式为：（其中的 α 取值在0.8 到 0.9之间，这个...
Get decimal portion of a number with JavaScript
I have float numbers like 3.2 and 1.6 .
22 Answers
22
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Some built-in to pad a list in python
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answered Aug 9 '10 at 9:43
John La RooyJohn La Rooy
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Rails - controller action name to string
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339
Rails 2.X: @controller.action_name
Rails 3.1.X: controller.action_name, action_name
Rails 4....
How to remove an element from a list by index
...y the index of the element you want to delete:
>>> a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> del a[-1]
>>> a
[0, 1, 2, 3, 4, 5, 6, 7, 8]
Also supports slices:
>>> del a[2:4]
>>> a
[0, 1, 4, 5, 6, 7, 8, 9]
Here is the section from the tutorial.
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C# short/long/int literal format?
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315
var d = 1.0d; // double
var d0 = 1.0; // double
var d1 = 1e+3; // double
var d2 = 1e-3; ...
Two-dimensional array in Swift
...ray of arrays of Ints set to 0. Arrays size is 10x5
var arr = Array(count: 3, repeatedValue: Array(count: 2, repeatedValue: 0))
// ...and for Swift 3+:
var arr = Array(repeating: Array(repeating: 0, count: 2), count: 3)
Change element at position
arr[0][1] = 18
OR
let myVar = 18
arr[0][1] = m...
Rails: Check output of path helper from console
... a Rails console, you can call app.post_path. This will work in Rails ~= 2.3 and >= 3.1.0.
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