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Why does the JVM still not support tail-call optimization?
...tail-call-optimizations , there seems to be a prototype implementation and MLVM has listed the feature as "proto 80%" for some time now.
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Deep copy of a dict in python
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Is there any difference in Python 3.2 and 2.7 codes? They seem identical to me. If so, would be better a single block of code and a statement "Works for both Python 3 and 2"
– MestreLion
Jun 7 '14 at 3:59
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MIT官方已升级至2.70版本，中文网待测试并升级相关特性 - App Inventor 2 ...
2.70 版本主要更新内容：
Features:Add a Japanese translationUpdate the Spanish translationMake the Sharing component respect DefaultFileScope when sharing relative path files (@arjuninv)Add TextChange event, MoveCursor methods, and HintColor property to TextBox and related components (@gordo...
Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABL...
运行故障：edu.mit.appinventor aicompanion3: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent. Strongly consider using FLAG IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being ...
Call to ‘set-and-coerce-property!’ has too few arguments (3; must be...
编译apk，报错：Call to ‘set-and-coerce-property!’ has too few arguments (3; must be 4)
原因是因为代码块有问题/报错，有空的地方没有填值，比如这种：
参考：https://community.appinventor.mi ... 3-must-be-4/20690/4
又学习到了新bug的解决方法...
Service and Characteristic are not published by the connected device -...
Service and Characteristic are not published by the connected device，报错如下：
问题原因：硬件/蓝牙芯片问题导致的，比如A硬件测试好的，换了B硬件没有修改uuid，就出现这个报错。
由于B硬件没有发布这些特征，就会报这个错误。
What characters are allowed in an email address?
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See RFC 5322: Internet Message Format and, to a lesser extent, RFC 5321: Simple Mail Transfer Protocol.
RFC 822 also covers email addresses, but it deals mostly with its structure:
addr-spec = local-part "@" domain ; global address
local-part ...
jQuery: How can i create a simple overlay?
...simply put, a div that stays fixed on the screen (no matter if you scroll) and has some sort of opacity.
This will be your CSS for cross browser opacity of 0.5:
#overlay {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #000;
filter:alpha(...
Best XML Parser for PHP [duplicate]
I have used the XML Parser before, and even though it worked OK, I wasn't happy with it in general, it felt like I was using workarounds for things that should be basic functionality.
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JavaScript: Class.method vs. Class.prototype.method
...ill be available to all the object instances created with the new keyword, and the context within that function (the this keyword) will refer to the actual object instance where you call it.
Consider this example:
// constructor function
function MyClass () {
var privateVariable; // private memb...