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How to check if a json key exists?
... What if the key is from Integer type?
– Eido95
May 15 '17 at 19:33
2
@Eido95 having an I...
When - and why - should you store data in the Windows Registry?
...ay share a windows folder, and it should be read-only anyway.
Solution (Win95): Registry with separate sections for each user.
Problem: Registry grew too big.
Solution (WinXP): Large blocks of individual data moved to user's own Application Data folder.
Problem: Good for large amounts of data, but r...
Structure padding and packing
...est_struct_address():
stu_g: 4
stu_h: 8
stu_f: 24
address of g: 0x7fffd63a95d0 // struct variable - address dividable by 16,
address of h: 0x7fffd63a95e0 // struct variable - address dividable by 16,
address of f1: 0x7fffd63a95f0 // struct variable - address dividable by 16,
address of f2: 0x7fff...
Logical operators for boolean indexing in Pandas
... answered Jan 25 '19 at 2:53
cs95cs95
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Const in JavaScript: when to use it and is it necessary?
...ror
But you can mutate your variable:
const marks = [92, 83]
marks.push(95)
console.log(marks) // [92, 83, 95] -> the variable has been mutated.
So, any process that changes the variable's value without using the = sign is mutating the variable.
Note: += for example is ... re-assigning!
va...
Why is there an injected class name?
... to refer to the current instantiation. See DR 176 for a change between C++98 and C++03 that clarified that.
The idea of the injected class name was present in C++98, but the terminology was new for C++03.
C++98 says:
A class-name is inserted into the scope in which it is declared immediately ...
Eclipse RCP Plug-in开发自学教程（Eclipse3.6） - 文档下载 - 清泛网 - ...
..............................................................................98
8.1 概述 ............................................................................................................................................98
8.2 示例 ..........................................................
Compile time string hashing
...int32_t crc_table[256] = {
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
...
};
template<size_t idx>
constexpr uint32_t crc32(const c...
unable to start mongodb local server
...s Jung:
"Sat Jun 25 09:38:51 [initandlisten] listen(): bind() failed errno:98 Address already in use for socket: 0.0.0.0:27017
is self-speaking.
Another instance of mongod is already running and allocating the MongoDB default port which is 27017.
Either kill the other process or use a different port...
Java Byte Array to String to Byte Array
...ue will not be a array anymore. For example :
byte[] b1 = new byte[] {97, 98, 99};
String s1 = Arrays.toString(b1);
String s2 = new String(b1);
System.out.println(s1); // -> "[97, 98, 99]"
System.out.println(s2); // -> "abc";
As you can see, s1 holds the string representatio...