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How do I convert a Ruby class name to a underscore-delimited symbol?
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how to do the reverse?
– user1406062
May 26 '13 at 8:39
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show 4 more comments
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Filtering a list based on a list of booleans
...rue, False, True, False]
>>> %timeit list(compress(list_a, fil))
100000 loops, best of 3: 2.58 us per loop
>>> %timeit [i for (i, v) in zip(list_a, fil) if v] #winner
100000 loops, best of 3: 1.98 us per loop
>>> list_a = [1, 2, 4, 6]*100
>>> fil = [True, False,...
App Inventor 2 DynamicComponents 拓展：动态创建AI2组件对象 · App Inventor 2 中文网
...DynamicComponents 拓展
.aix 拓展下载（最新版 v2.3.0）：
com.yusufcihan.DynamicComponents.aix
完全支持 App Inventor 2 的动态组件扩展。它基于 Java 的反射功能，因此只需键入类名称即可搜索类来创建组件。因此，它对特定组件的支...
UIView with rounded corners and drop shadow?
...nd drop shadow to v, a UIView:
// border radius
[v.layer setCornerRadius:30.0f];
// border
[v.layer setBorderColor:[UIColor lightGrayColor].CGColor];
[v.layer setBorderWidth:1.5f];
// drop shadow
[v.layer setShadowColor:[UIColor blackColor].CGColor];
[v.layer setShadowOpacity:0.8];
[v.layer setSh...
Heroku error: “Permission denied (public key)”
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edited Jul 15 '14 at 19:05
ElGavilan
5,42688 gold badges2323 silver badges3535 bronze badges
answered ...
How to use RSpec's should_raise with any kind of exception?
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380
expect { some_method }.to raise_error
RSpec 1 Syntax:
lambda { some_method }.should raise_err...
How to import existing *.sql files in PostgreSQL 8.4?
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edited Aug 3 '10 at 6:38
answered Aug 3 '10 at 6:16
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What is the opposite of :hover (on mouse leave)?
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10 Answers
10
Active
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What is the difference between JavaConverters and JavaConversions in Scala?
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EDIT: Java Conversions got @deprecated in Scala 2.13.0. Use scala.jdk.CollectionConverters instead.
JavaConversions provide a series of implicit methods that convert between a Java collection and the closest corresponding Scala collection, and vice versa. This is done by creat...
Re-entrant locks in C#
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150
No, not as long as you are locking on the same object. The recursive code effectively already h...