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How does grep run so fast?
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Assuming your question regards GNU grep specifically. Here's a note from the author, Mike Haertel:
GNU grep is fast because it AVOIDS LOOKING AT EVERY INPUT BYTE.
GNU grep is fast because it EXECUTES VERY FEW INSTRUCTIONS FOR EACH
BYTE that it
does look at.
GNU grep uses th...
Why is there no xrange function in Python3?
...e iteration.
And as for "consumes much more resources than Python 2.6+", from my tests, it looks like a 3.x range is exactly the same size as a 2.x xrange—and, even if it were 10x as big, building the unnecessary list is still about 10000000x more of a problem than anything the range iteration c...
Difference between no-cache and must-revalidate
From the RFC 2616
4 Answers
4
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What is the difference between AF_INET and PF_INET in socket programming?
...l source code that PF_INET and AF_INET are the same.
The following code is from file include/linux/socket.h, line 204 of Linux kernel 3.2.21 tree.
/* Protocol families, same as address families. */
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#define PF_INET AF_INET
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Best way to specify whitespace in a String.Split operation
...(new char[0]);
then white-space is assumed to be the splitting character. From the string.Split(char[]) method's documentation page.
If the separator parameter is null or contains no characters, white-space characters are assumed to be the delimiters. White-space characters are defined by the Unic...
When should iteritems() be used instead of items()?
...s() instead of iteritems() in all places? Why was iteritems() removed from Python 3? Seems like a terrific and useful method. What's the reasoning behind it?
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Azure table storage returns 400 Bad Request
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For the love of God, if someone from the Azure team reads this, please make the SDK return more information than the 400 Bad Request error. I have no idea why the DateTime in table storage can't have the same minimum date as the .NET DateTime object, but I...
Kotlin Ternary Conditional Operator
... but invalid Java/C#/JavaScript
var v = if (a) b else c
If you're coming from a language where if is a statement, this might seem unnatural but that feeling should soon subside.
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How to import multiple .csv files at once?
...iple data.csv files, each containing the same number of variables but each from different times.
Is there a way in R to import them all simultaneously rather than having to import them all individually?
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Java: Instanceof and Generics
...ok like this:
if (arg0 != null && !(this.type.isAssignableFrom(arg0.getClass()))
{
return -1;
}
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