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How to mkdir only if a directory does not already exist?
...'t exist.
Some implementation like GNU mkdir include mkdir --parents as a more readable alias, but this is not specified in POSIX/Single Unix Specification and not available on many common platforms like macOS, various BSDs, and various commercial Unixes, so it should be avoided.
If you want an er...
T-SQL Cast versus Convert
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CONVERT is SQL Server specific, CAST is ANSI.
CONVERT is more flexible in that you can format dates etc. Other than that, they are pretty much the same. If you don't care about the extended features, use CAST.
EDIT:
As noted by @beruic and @C-F in the comments below, there is pos...
What is difference between MVC, MVP & MVVM design pattern in terms of coding c#
... "The view usually does not call the presenter" ? can you explain more about this sentence ? if ui view is not gonna call the presenter who is going to ?
– Amir Ziarati
Dec 13 '16 at 7:24
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What is the best open-source java charting library? (other than jfreechart) [closed]
Why are there not more opensource easy to use charting libraries for Java?. The only successful opensource project in this area seems to be jfreechart, and it doesn't even have any documentation or examples available.
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Parse large JSON file in Nodejs
...'s a newline somewhere in the buffer
if (pos == 0) { // if there's more than one newline in a row, the buffer will now start with a newline
buf = buf.slice(1); // discard it
continue; // so that the next iteration will start with data
}
processLine(buf...
How to explain dependency injection to a 5-year-old? [closed]
...matter why you are invoking your object, it uses the same dependencies.
A more powerful technique is to be able to create your object and provide it with dependencies to use. So you might create a database connection to use, then hand it to your object. This way, you can create your object with di...
Is it secure to store passwords as environment variables (rather than as plain text) in config files
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On a more theoretical level, I tend to think about levels for security in the following ways (in order of increasing strength) :
No security. Plain text. Anyone that knows where to look, can access the data.
Security by Obfusc...
Getting a slice of keys from a map
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Remove blank lines with grep
...y work for files with zero or 1 space on the line, not for files with 2 or more spaces. Change ? to *.
– Ed Morton
Dec 8 '12 at 9:42
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