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What is the difference between varchar and varchar2 in Oracle?
...
Taken from the latest stable Oracle production version 12.2:
Data Types
The major difference is that VARCHAR2 is an internal data type and VARCHAR is an external data type. So we need to understand the difference between an internal and ext...
Javascript equivalent of Python's zip function
...if you use the second answer with variadic arguments, you may want to perf test it.)
Here's a oneliner:
function zip(arrays) {
return arrays[0].map(function(_,i){
return arrays.map(function(array){return array[i]})
});
}
// > zip([[1,2],[11,22],[111,222]])
// [[1,11,111],[2,2...
How to autosize a textarea using Prototype?
...;/html>
PS: Obviously this JavaScript code is very naive and not well tested, and you probably don't want to use it on textboxes with novels in them, but you get the general idea.
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impro...
fstream默认不支持中文路径和输出整数带逗号的解决办法 - C/C++ - 清泛网 -...
...("测试"); //新建一个中文文件夹
ofstream outfile( "测试/test.txt", ios::out ); //创建文件
if( !outfile )
{
cout << "Failed to create file!";
return ;
}
outfile.close();
}
程序将输出创建文件夹失败的信息。
一个解决办法是：在...
Where is array's length property defined?
...tuff = stuff;
}
}
public static void main(String[] args) {
int[] test = new int[5];
test[0] = 2;
test[1] = 33;
System.out.println("Length of int[]:\t" + test.length);
String[] test2 = new String[5];
test2[0] = "2";
test2[1] = "33";
System.out.println("Lengt...
Is there a performance difference between i++ and ++i in C++?
...double(CLOCKS_PER_SEC)) << '\n';
return 0;
}
O(n) increment
Test
// b.cc
#include <array>
class Something {
public:
Something& operator++();
Something operator++(int);
private:
std::array<int,PACKET_SIZE> data;
};
Something& Something::operator++()
{...
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
... are more favorable to -Os optimizations.
Here are the results for time ./test 0 0 on several processors (user time reported):
Processor (System-on-Chip) Compiler Time (-O2) Time (-Os) Fastest
AMD Opteron 8350 gcc-4.8.1 0.704s 0.896s -O2
AMD FX-63...
Is object empty? [duplicate]
What is the fastest way to check if an object is empty or not?
23 Answers
23
...
How do I import the Django DoesNotExist exception?
I'm trying to create a UnitTest to verify that an object has been deleted.
6 Answers
6...
Add a new item to a dictionary in Python [duplicate]
...lt_data + {'item3': 3}
{'item2': 2, 'item3': 3, 'item1': 1}
>>> {'test1': 1} + Dict(test2=2)
{'test1': 1, 'test2': 2}
Note that this is more overhead then using dict[key] = value or dict.update(), so I would recommend against using this solution unless you intend to create a new dictionar...