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Calculate the median of a billion numbers
...
Just tried on an Intel i5-4200M @3.1 GHz (4 cores). According to the time command applied to the whole pipeline, it took real=36m24s ("wall clock time"), user=113m15s ("parallel time", all cores added). The longest command, far ahead the others, was sort, e...
What's the difference between a Future and a Promise?
...s that the client cannot set the value of the future.
Both Spring and EJB 3.1 have an AsyncResult class, which is similar to the Scala/C++ promises. AsyncResult does implement Future but this is not the real future: asynchronous methods in Spring/EJB return a different, read-only Future object thro...
Why do people say that Ruby is slow? [closed]
...en?
Most folks are waiting for Ruby 1.9.1. I myself am waiting for Rails 3.1 on Ruby 1.9.1 on JRuby.
Finally, please remember that a lot of developers choose Ruby because it makes programming a more joyful experience compared to other languages, and because Ruby with Rails enables skilled web de...
Do I need a content-type header for HTTP GET requests?
...
According to the RFC 7231 section 3.1.5.5:
A sender that generates a message containing a payload body SHOULD generate a Content-Type header field in that message unless the intended media type of the enclosed representation is unknown to the sender. If a...
What is the list of possible values for navigator.platform as of today? [closed]
... they all stick to Win32.
OS/2 (1994†)
Pocket PC
Windows
Win16: Windows 3.1x (1992†)
Win32: Windows 95 and up
WinCE
Mozilla (Firefox OS)
An empty string is returned in the web browser on Firefox OS. See this bug report.
KaiOS
The web browser on KaiOS (based on Firefox) also returns the empty s...
How can I use threading in Python?
...()
And the timing results:
Single thread: 14.4 seconds
4 Pool: 3.1 seconds
8 Pool: 1.4 seconds
13 Pool: 1.3 seconds
Passing multiple arguments (works like this only in Python 3.3 and later):
To pass multiple arrays:
results = pool.starmap(function, zip(list_a, list_b))...
Backing beans (@ManagedBean) or CDI Beans (@Named)?
...mport the Seam 3 framework (Weld). That worked pretty well.
In GlassFish 3.1 CDI stopped working, and the Seam Weld stopped working with it. I opened a bug on this but haven't seen it fixed yet. I had to convert all my code to using the javax.faces.* annotations but I plan to move back to CDI on...
Difference between class and type
...se values are 16-bit unsigned integers
representing UTF-16 code units (§3.1).
b) The floating-point types are float, whose values include the 32-bit
IEEE 754 floating-point numbers, and double, whose values include the
64-bit IEEE 754 floating-point numbers.
c) The boolean type has ...
Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...(sideLength)."
}
}
var triangle = EquilateralTriangle(sideLength: 3.1, name: "a triangle")
triangle.perimeter
triangle.perimeter = 9.9
triangle.sideLength
在 perimeter 的 setter 中，新的值的名字就是 newValue 。你可以提供一个在 set 之后提供一个不冲突的名...
Recursion in Angular directives
...
title: '3',
sub: 'tea',
children: [{
title: '3.1',
sub: 'green tea',
children: [{
title: '3.1.1',
sub: 'green coffee',
children: [{
title: '3.1.1.1',
sub: 'green milk',
children: [...