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Logical operators for boolean indexing in Pandas
...[4])
>>> a3[np.bitwise_and(a1, a2)]
array([1, 1, 1, 2])
Summary table
Logical operator | NumPy logical function | NumPy bitwise function | Bitwise operator
-------------------------------------------------------------------------------------
and | np.logical_and | np...
For-each over an array in JavaScript
...bject may not be honest. It's in §8.6.2, several paragraphs below the big table near the beginning of that section), where it says:
Host objects may implement these internal methods in any manner unless specified otherwise; for example, one possibility is that [[Get]] and [[Put]] for a particul...
A monad is just a monoid in the category of endofunctors, what's the problem?
...noid in monoidal category" comes later in the book as you can see from the table of contents. And yet understanding this notion is absolutely critical to understanding the connection with monads.
(Strict) monoidal categories
Going to Chapter VII on Monoids (which comes later than Chapter VI on Mon...
Move assignment operator and `if (this != &rhs)`
...nd is a test-and-branch. Both work. Both meet all of the requirements of Table 22 MoveAssignable requirements in the C++11 standard. The third also works modulo the non-memory-resource-concern.
All three implementations can have different costs depending on the hardware: How expensive is a bran...
C++ performance vs. Java/C#
...) in C# without tremendous work, while it's a built-in feature of C++. Immutable data is an interesting solution, but not everything can be made immutable, so it's not even enough, by far).
So, C# remains an pleasant language as long as you want something that works, but a frustrating language the...
Polymorphism in C++
...types.
"to" parametric types from values of constant type
They do not establish polymorphic contexts by themselves, but do help empower/simplify code inside such contexts.
You may feel cheated... it doesn't seem like much. The significance is that in parametric polymorphic contexts (i.e. inside...
Unicode equivalents for \w and \b in Java regular expressions?
... talk about whitespace properly is super-annoying. Consider the following table. For each of those code points, there is both a J-results column
for Java and a P-results column for Perl or any other PCRE-based regex engine:
Regex 001A 0085 00A0 2029
J...
OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...回调函数分别为easy_connection_on_readable，easy_connection_on_writable和easy_connection_on_timeout_conn(注意，仅仅是初始化，还没有激活)
6. 激活该连接的read_watcher(即让该连接所属的IO线程的event loop监听这个连接的读事件)， 设置其回调函数为e...
Should a Netflix or Twitter-style web service use REST or SOAP? [closed]
...been waiting for a question like this for close to a year now. It was inevitable that this day would come and I am sure we are going to see many more questions like this in the coming months.
The warning signs
You are absolutely correct, it does take longer to build RESTful clients than SOAP clien...
Difference between MEAN.js and MEAN.io
... is the one between MEAN.io and MEAN.js in a more readable format
<table border="1" cellpadding="10"><tbody><tr><td valign="top" width="33%"><br><br><h1>MeanJS.org. provides these benefits that MEAN.io. doesn't</h1><br><br><b>Hel...