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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...AI2组件对象
【Hash】文件Hash拓展：文件哈希计算和 Base64 编码文件，sha256、sha512 哈希
【向量计算】VectorArithmetic 拓展：计算两个向量相加的结果向量
【手机管理】App Inventor 2 TaifunTM 拓展：获取本机手机号码
【电池管理】Ap...
Secure hash and salt for PHP passwords
...r character, which at 8 characters for a password is still too low (52.679 bits of entropy) for future security. But the good news is: longer passwords, and passwords with unicode characters, really increase the entropy of a password and make it harder to crack.
There's a longer discussion of passw...
How to nicely format floating numbers to String without unnecessary decimal 0?
An 64-bit double can represent integer +/- 2 53 exactly
26 Answers
26
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Preserve line endings
I run sed to do some substitution on windows and I noticed that it automatically converts line endings to Unix (\n). Is there an option to tell sed to use Windows line endings (\r\n) or even better to preserve the line endings from the file?
...
How do I determine whether my calculation of pi is accurate?
...ithms that were fairly easy to implement.
However, nowadays, things are a bit different. In the last three world records, instead of performing two computations, we performed only one computation using the fastest known formula (Chudnovsky Formula):
This algorithm is much harder to implement, bu...
What is __init__.py for?
...mes in, e.g., import statements. Because these can be any directory, and arbitrary ones can be added by the end user, the developers have to worry about directories that happen to share a name with a valid Python module, such as 'string' in the docs example. To alleviate this, it ignores directories...
How to turn off INFO logging in Spark?
...to 163. However creating the SparkContext itself logs 163, up to
15/08/25 10:14:16 INFO SparkDeploySchedulerBackend: SchedulerBackend is ready for scheduling beginning after reached minRegisteredResourcesRatio: 0.0
and it's not clear to me how to adjust those programmatically.
...
How do I launch the Android emulator from the command line?
... ERROR:./android/qt/qt_setup.cpp:28:Qt library not found at ../emulator/lib64/qt/lib, starting emulator from $ANDROID_HOME/tools is a workaround. github.com/decosoftware/deco-ide/issues/289
– tebanep
Jul 13 '17 at 18:35
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What is difference between Collection.stream().forEach() and Collection.forEach()?
...
River
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answered Apr 23 '14 at 0:14
Stuart MarksStuart ...
Check if at least two out of three booleans are true
...;
Thread.sleep(1000);
}
}
}
This prints the following on my machine (running Ubuntu on Intel Core 2 + sun java 1.6.0_15-b03 with HotSpot Server VM (14.1-b02, mixed mode)):
First and second iterations:
a&&b || b&&c || a&&c : 1740 ms
a ? b||c : b&...