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How to check whether a file or directory exists?
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You can use this :
if _, err := os.Stat("./conf/app.ini"); err != nil {
if os.IsNotExist(...
How dangerous is it to access an array out of bounds?
...inistrative) access, for example. Even with ordinary user privileges, a malfunctioning program can consume excessive resources (CPU, memory, disk), possibly bringing down the entire system. A lot of malware (viruses, etc.) exploits buffer overruns to gain unauthorized access to the system.
(One his...
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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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...
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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+50
Edit 20...
How to pass a function as a parameter in Java? [duplicate]
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You could use Java reflection to do this. The method would be represented as an instance of j...
private final static attribute vs private final attribute
... giving values to its final variables...
– jamesdeath123
Jan 30 '15 at 22:08
Just in case anyone stumbles on this, ple...
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...