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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...
JavaScript math, round to two decimal places [duplicate]
... the number results in 1.005 for instance, this will round to 1 instead of 1.1. Discount below would equal 1 instead of 1.1 let price = 98.995 let listprice = 100 var discount = Math.round((100 - (price / listprice) * 100) * 100) / 100;
– Bryce
Sep 8 '17 at 13...
Java Delegates?
...he Inner Classes Specification included
in the documentation for the JDKTM 1.1 software.
It is unlikely that the Java programming language will ever include
this construct. Sun already carefully considered adopting it in 1996,
to the extent of building and discarding working prototypes. Our
conclusi...
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...
Unsupported major.minor version 52.0 [duplicate]
...va SE 6.0 = 50
Java SE 5.0 = 49
JDK 1.4 = 48
JDK 1.3 = 47
JDK 1.2 = 46
JDK 1.1 = 45
These are the assigned major numbers. The error regarding the unsupported major.minor version is because during compile time you are using a higher JDK and a lower JDK during runtime.
Thus, the 'major.minor version ...
How to query as GROUP BY in django?
...
No problem. I thought about mentioning 1.1 aggregation features but made the assumption you were using the release version :)
– Van Gale
Mar 10 '09 at 11:26
...
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))...
StringUtils 字符串工具扩展：强大的文本处理工具集 · App Inventor 2 中文网
...
1.0
2024-06-15
初始版本
1.1
2025-04-20
添加 getASCIICode、getASCIIChar
1.2
2025-09-02
添加 Replace、Index、Email、InetAddress 函数
截图
示例应用
...