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Remove all whitespace in a string
I want to eliminate all the whitespace from a string, on both ends, and in between words.
10 Answers
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Run Cron job every N minutes plus offset
...on
An * in the minute field is the same as 0-59/1 where 0-59 is the range and 1 is the step. The command will run at the first minute in the range (0), then at all successive minutes that are distant from the first by step (1), until the last (59).
Which is why */20 * * * * will run at 0 minutes, ...
Weighted random numbers
I'm trying to implement a weighted random numbers. I'm currently just banging my head against the wall and cannot figure this out.
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Replace new lines with a comma delimiter with Notepad++?
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Open the find and replace dialog (press CTRL+H).
Then select Regular expression in the 'Search Mode' section at the bottom.
In the Find what field enter this: [\r\n]+
In the Replace with: ,
There is a space after the comma.
This w...
'is' versus try cast with null check
...// only one cast
if (myObjRef != null)
{
// myObjRef is already MyType and doesn't need to be cast again
...
}
C# 7.0 supports a more compact syntax using pattern matching:
if (myObj.myProp is MyType myObjRef)
{
...
}
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Ukkonen's suffix tree algorithm in plain English
...st String Searching With Suffix Trees , but he glosses over various points and some aspects of the algorithm remain unclear.
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How can I pass command-line arguments to a Perl program?
I'm working on a Perl script. How can I pass command line parameters to it?
9 Answers
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How do I clear the std::queue efficiently?
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A common idiom for clearing standard containers is swapping with an empty version of the container:
void clear( std::queue<int> &q )
{
std::queue<int> empty;
std::swap( q, empty );
}
It is also the only way of actually clearing th...
Using StringWriter for XML Serialization
...t prefixed with an upper-case "N", hence an 8-bit encoding, such as UTF-8) and not an NVARCHAR string (prefixed with an upper-case "N", hence the 16-bit UTF-16 LE encoding).
The fix should have been as simple as:
In the first case, when adding the declaration stating encoding="utf-8": simply don'...
Calling Java varargs method with single null argument?
If I have a vararg Java method foo(Object ...arg) and I call foo(null, null) , I have both arg[0] and arg[1] as null s. But if I call foo(null) , arg itself is null. Why is this happening?
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