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How to remove convexity defects in a Sudoku square?
I was doing a fun project: Solving a Sudoku from an input image using OpenCV (as in Google goggles etc). And I have completed the task, but at the end I found a little problem for which I came here.
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SET versus SELECT when assigning variables?
...(so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one)
When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from its previous valu...
Difference between API and ABI
... to use some library function we write code like:
long howManyDecibels = 123L;
int ok = livenMyHills( howManyDecibels);
and we needed to know that there is a method livenMyHills(), which takes a long integer parameter. So as a Programming Interface it's all expressed in source code. The compile...
Socket.IO Authentication
...rst_name: 'John',
last_name: 'Doe',
email: 'john@doe.com',
id: 123
};
// we are sending the profile in the token
var token = jwt.sign(profile, jwtSecret, { expiresInMinutes: 60*5 });
res.json({token: token});
});
Now, your socket.io server can be configured as follows:
var s...
How to check whether a file or directory exists?
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123
You can use this :
if _, err := os.Stat("./conf/app.ini"); err != nil {
if os.IsNotExist(...
Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT
...table can be created again. Ubuntu 16, mariadb
– waza123
Jan 21 '19 at 18:07
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What is Hindley-Milner?
...anguages). The advantages of Hindley-Milner are
It supports polymorphic functions; for example, a function that can give you the length of the list independent of the type of the elements, or a function does a binary-tree lookup independent of the type of keys stored in the tree.
Sometimes a func...
How to get a URL parameter in Express?
...issue on getting the value of tagid from my URL: localhost:8888/p?tagid=1234 .
4 Answers
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How to get the mouse position without events (without moving the mouse)?
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123
+50
Edit 20...
How to pass a function as a parameter in Java? [duplicate]
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123
You could use Java reflection to do this. The method would be represented as an instance of j...