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Why does Clojure have “keywords” in addition to “symbols”?
...vide very fast equality tests...
Symbols are identifiers that are normally used to refer to something else. They can be used in program forms to refer to function parameters, let bindings, class names and global vars...
Keywords are generally used as lightweight "constant strings", e.g. for t...
What is the maximum size of a web browser's cookie's key?
...rt most browsers, I suggest keeping the name under 4000 bytes, and the overall cookie size under 4093 bytes.
One thing to be careful of: if the name is too big you cannot delete the cookie (at least in JavaScript). A cookie is deleted by updating it and setting it to expire. If the name is too big,...
How to create multiple directories from a single full path in C#?
...: "C:\dir0\dir1\dir2\dir3\dir4\" how would you best implement it so that all directories are present?
2 Answers
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What is the difference between isinstance('aaa', basestring) and isinstance('aaa', str)?
...trings, would it not be better to just have Unicode since that would cover all the cases? Well it is better to have only Unicode but Python was created before Unicode was the preferred method for representing strings. It takes time to transition the string type in a language with many users, in Pyth...
Where does Jenkins store configuration files for the jobs it runs?
...y different EC2 instance at any point. We have a bunch of Puppet manifests allowing us to easily reinstall the software on the EC2 instance, but custom configuration files, like the ones for the jobs I create in Jenkins, would be deleted after the move.
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How to remove all subviews of a view in Swift?
I'm looking for a simple method to remove at once all subviews from a superview instead of removing them one by one.
20 Ans...
Your build failed due to an error in the AAPT stage, not because of an...
...中有一个 ASCII 空字符一个或多个屏幕名称包含下划线“_”字符 - 只能使用字母和数字图标文件不是 PNG 或太大（使用 96pix x 96pix 零压缩 PNG）该项目包含尚未针对 Android优化的图像 Optimize Images for AndroidProject、Screen、Block、Procedure ...
How to detect the device orientation using CSS media queries?
...n portrait orientation will cause the viewport to become wider than it is tall, thereby causing the browser to use landscape styles instead of portrait.
– Johann Combrink
Mar 10 '17 at 8:58
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How do shift operators work in Java? [duplicate]
...s, shifting is shorter/more efficient than converting an int to a double, calling Math.pow() and converting back to an int.) It's also useful for transforming an int value from signed (Java) to an unsigned equivalent (C/C++; Java doesn't have unsigned types, which is one of its shortcomings).
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Should I use a data.frame or a matrix?
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Something not mentioned by @Michal is that not only is a matrix smaller than the equivalent data frame, using matrices can make your code far more efficient than using data frames, often considerably so. That is one reason why internally, a lot of R functions will coerce to matrices data th...