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Ruby, !! operator (a/k/a the double-bang) [duplicate]
...the boolean context, but returns the proper boolean value.
For example:
"hello" #-> this is a string; it is not in a boolean context
!"hello" #-> this is a string that is forced into a boolean
# context (true), and then negated (false)
!!"hello" #-> this is a string that i...
Parse large JSON file in Nodejs
...ample:
npm install JSONStream event-stream
data.json:
{
"greeting": "hello world"
}
hello.js:
var fs = require('fs'),
JSONStream = require('JSONStream'),
es = require('event-stream');
var getStream = function () {
var jsonData = 'data.json',
stream = fs.createReadStream...
Accessing dict_keys element by index in Python3
...st results in a list of all the keys:
>>> test = {'foo': 'bar', 'hello': 'world'}
>>> list(test)
['foo', 'hello']
>>> list(test)[0]
'foo'
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...
Is the practice of returning a C++ reference variable evil?
...leton instance;
return instance;
};
void printHello()
{
printf("Hello");
};
}
Usage:
Singleton& my_sing = Singleton::instance(); // Valid Singleton instance
my_sing.printHello(); // "Hello"
Operators
Standard library containers ...
How can I declare and define multiple variables in one line using C++?
...#include <iostream>
#include <tuple>
int main ()
{
auto [hello, world] = std::make_tuple("Hello ", "world!");
std::cout << hello << world << std::endl;
return 0;
}
Demo
share
...
The $.param( ) inverse function in JavaScript / jQuery
... // 1
'x[y][0][z][]=1', // 2
'hello=[%22world%22]&world=hello', // 3
'a=1&a=2&&b&c=3&d=&=e&', // 4
'fld[2][]=2&fld[][]=3&fld[3][]=4&fld[]=bb&fld[]=cc', // 5
$.param({a:[[1,2],[3,4],...
How to pass optional arguments to a method in C++?
...1,4); // a = 1, b = 4
func(1); // a = 1, b = 0
std::string x = "Hello";
std::string y = "World";
func(x,y); // a = "Hello", b ="World"
func(x); // a = "Hello", b = ""
}
Note : The following are ill-formed
template <typename T>
void func(T a = T(), T b )
templa...
Private module methods in Ruby
...rivate
def upcase(s)
s.upcase
end
end
end
Writer.output "Hello World"
# -> HELLO WORLD
Writer.upcase "Hello World"
# -> so.rb:16:in `<main>': private method `upcase' called for Writer:Module (NoMethodError)
...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...号使用转义符后也不行）
双引号
your_name='qinjx'
str="Hello, I know your are \"$your_name\"! \n"
双引号里可以有变量
双引号里可以出现转义字符
字符串操作
拼接字符串
your_name="qinjx"
greeting="hello, "$your_name" !"
greeting_1="hello, $...
How do we use runOnUiThread in Android?
... {
AndroidBasicThreadActivity.textView.setText("Hello!! Android Team :-) From child thread.");
}
});
}
}
2.) By using View's post(Runnable runnable) method in worker thread
class MyAndroidThread implements Runnable
{
Activity activity;
...