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App Inventor 2 接入腾讯云 CloudBase：让你的 App 瞬间拥有专业级后端能力...
...数……你只需要关注业务逻辑。
而 App Inventor 中文网（fun123.cn）开发的 CloudBase 拓展，把这些能力封装成了 App Inventor 的积木块，拖拖拽拽就能调用。作为中文网自研且重点打造的专业级后端接入方案，此拓展将免费开放给所...
Kotlin Ternary Conditional Operator
...
You could define your own Boolean extension function that returns null when the Boolean is false to provide a structure similar to the ternary operator:
infix fun <T> Boolean.then(param: T): T? = if (this) param else null
This would make an a ? b : c expressio...
Reading a UTF8 CSV file with Python
...> w = unicodecsv.writer(f, encoding='utf-8')
>>> w.writerow((u'é', u'ñ'))
>>> f.seek(0)
>>> r = unicodecsv.reader(f, encoding='utf-8')
>>> row = r.next()
>>> print row[0], row[1]
é ñ
Python 3.X
In python 3 this is supported out of the box by the...
passing several arguments to FUN of lapply (and others *apply)
I have a question regarding passing multiple arguments to a function, when using lapply in R .
4 Answers
...
C++ performance challenge: integer to std::string conversion
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Ah, awesome challenge by the way... I've had a lot of fun with this.
I have two algorithms to submit (code is at the bottom if you feel like skipping to it). In my comparisons I require that the function return a string and that it can handle int and unsigned int. Comparing thi...
Is there a way to pass optional parameters to a function?
Is there a way in Python to pass optional parameters to a function while calling it and in the function definition have some code based on "only if the optional parameter is passed"
...
How to compile a static library in Linux?
...e lib
#include <stdio.h>
#include "lib.h"
int main ( void )
{
fun1(10);
fun2(10);
return 0;
}
lib.h the libs main header
#ifndef LIB_H_INCLUDED
#define LIB_H_INCLUDED
#include "lib1.h"
#include "lib2.h"
#endif
lib1.c first lib source
#include "lib1.h"
#include <stdio...
What are inline namespaces for?
...NS to work, there has to be a corresponding Q_NAMESPACE in the same file⁽¹⁾. And there can only be one, or you get duplicate definition errors. This, effectively, means that all of your enumerations have to be in the same header. Yuck.
Or... you can use inline namespaces. Hiding enumerations i...
上线当天App就崩了，才发问题是手机网络超时没处理——用App Inventor 2的W...
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参考文档：App Inventor 2 Web客户端完整文档 → https://www.fun123.cn/reference/components/connectivity.html
JSON解析案例：JSON转字典教程 → https://www.fun123.cn/reference/blocks/dictionaries.html
文件上传方案：App Inventor 2 文件上传到服务器全方...
Move all files except one
... empties the whole Old -directory. What is wrong?
– Léo Léopold Hertz 준영
Mar 22 '09 at 3:28
5
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