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List comprehension in Ruby
...k.nil?
self.collect(&block).compact
end
end
some_array = [1, 2, 3, 4, 5, 6]
new_array = some_array.comprehend {|x| x * 3 if x % 2 == 0}
puts new_array
Prints:
6
12
18
I would probably just do it the way you did though.
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What is IP address '::1'?
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edited Mar 27 '13 at 21:25
answered Jan 6 '11 at 3:18
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Version of SQLite used in Android?
...database.sqlite package-level javadoc
Using the emulators:
adb shell sqlite3 --version
UPDATE: Since SDK 29 (emulator revision 8), the adb shell command gives:
/system/bin/sh: sqlite3: inaccessible or not found
Any ideas why? Issue tracker here.
SQLite 3.28.0 (window functions!):
30-11.0-R (Re...
[] and {} vs list() and dict(), which is better?
...gt;> from timeit import timeit
>>> timeit("[]")
0.040084982867934334
>>> timeit("list()")
0.17704233359267718
>>> timeit("{}")
0.033620194745424214
>>> timeit("dict()")
0.1821558326547077
and for non-empty:
>>> timeit("[1,2,3]")
0.24316302770330367
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水果vs蔬菜智能分类器 - EdgeML图像识别项目 · App Inventor 2 中文网
...数据收集策略
2. 高级数据收集技巧
3. 使用 MIT 机器学习平台训练模型
4. 深度验证和测试
5. 模型优化与部署
第三步：App Inventor 项目设置
1. ...
What is the difference between 0.0.0.0, 127.0.0.1 and localhost?
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rav_kr
43688 silver badges1616 bronze badges
answered Dec 26 '13 at 3:52
Captain PedanticCaptain Pedantic
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Append a NumPy array to a NumPy array
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234
In [1]: import numpy as np
In [2]: a = np.array([[1, 2, 3], [4, 5, 6]])
In [3]: b = np.array(...
Number.sign() in javascript
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Ricardo Rocha
5,96355 gold badges4343 silver badges7676 bronze badges
answered Jan 31 '12 at 12:32
kbeckbec
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What to use as an initial version? [closed]
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answered Sep 16 '10 at 16:39
community wiki
Bet...
RegEx - Match Numbers of Variable Length
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135
{[0-9]+:[0-9]+}
try adding plus(es)
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