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Extracting the last n characters from a ruby string
...a one liner, you can put a number greater than the size of the string:
"123".split(//).last(5).to_s
For ruby 1.9+
"123".split(//).last(5).join("").to_s
For ruby 2.0+, join returns a string
"123".split(//).last(5).join
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App Inventor 2 数学积木完全指南：从加减乘除到位运算，一篇搞定所有计算...
...现三个甚至更多数字同时运算：
加法： 1 + 2 + 3 + 4 = 10 （一个积木搞定，不用嵌套）
乘法： 2 x 3 x 4 = 24 （同理，一个积木搞定）
幂运算积木 ^ 也非常实用：2 ^ 3 = 8，...
i18n Pluralization
...pdated answer for languages with multiple pluralization (tested with Rails 3.0.7):
File config/initializers/pluralization.rb:
require "i18n/backend/pluralization"
I18n::Backend::Simple.send(:include, I18n::Backend::Pluralization)
File config/locales/plurals.rb:
{:ru =>
{ :i18n =>
...
All possible array initialization syntaxes
...s above, the first two could replace the string[] on the left with var (C# 3+), as the information on the right is enough to infer the proper type. The third line must be written as displayed, as array initialization syntax alone is not enough to satisfy the compiler's demands. The fourth could also...
Iterating through a list in reverse order in java
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answered Jan 20 '10 at 15:34
John FeminellaJohn Feminella
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匿名过程入门：倒计时与回调 - App Inventor 2 案例教程 · App Inventor 2 中文网
...：把过程存进变量
第 2 关：给匿名过程加输入项
第 3 关：后台运行 + 回调（本篇高潮）
第 4 关：延时倒计时 3、2、1
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这一篇做一个匿名过程练习场...
How do I browse an old revision of a Subversion repository through the web view?
...lt;revision_number>/
E.g.
http://www.example.com/svnrepository/!svn/bc/3/
Alternative
From Bert Huijben's comment:
If your repository is hosted using Subversion 1.6.0 or later, you can
use example.com/svnrepository/?p=3 for the same result... This method
/is/ documented. (?r= revision of the ...
Append a dictionary to a dictionary [duplicate]
... For example,
>>> d1 = {1: 1, 2: 2}
>>> d2 = {2: 'ha!', 3: 3}
>>> d1.update(d2)
>>> d1
{1: 1, 2: 'ha!', 3: 3}
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Cannot ping AWS EC2 instance
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answered May 30 '15 at 9:39
RakibRakib
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Rails 3 execute custom sql query without a model
...t that is supposed to deal with database. I used code given below in rails 3
5 Answers
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