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What is the “double tilde” (~~) operator in JavaScript? [duplicate]
...! Better use zero right shift (>>0), it's the fastest one, and looks more similar to signed-to-unsigned conversion (>>>0).
– Triang3l
Dec 21 '12 at 14:20
...
How can I concatenate regex literals in JavaScript?
...e + expression_two.source, flags);
// regex3 is now /foobar/gy
It's just more wordy than just having expression one and two being literal strings instead of literal regular expressions.
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im...
Pandas read_csv low_memory and dtype options
...or long() with base 10: 'foobar'
dtypes are typically a numpy thing, read more about them here:
http://docs.scipy.org/doc/numpy/reference/generated/numpy.dtype.html
What dtypes exists?
We have access to numpy dtypes: float, int, bool, timedelta64[ns] and datetime64[ns]. Note that the numpy date/tim...
Which is the fastest algorithm to find prime numbers?
...mentation of the Sieve of Atkin is Dan Bernstein's primegen. This sieve is more efficient than the Sieve of Eratosthenes. His page has some benchmark information.
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Difference between static memory allocation and dynamic memory allocation
... application to crash, since at some point of time, system cannot allocate more memory.
int* func() {
int* mem = malloc(1024);
return mem;
}
int* mem = func(); /* still accessible */
In the upper example, the allocated memory is still valid and accessible, even though the function termin...
CSS: bolding some text without changing its container's size
...ion, although I recommend flipping that one to 1px 0px 0px. Looks a little more bold-like.
– M. Herold
Mar 28 '13 at 0:34
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How to convert a factor to integer\numeric without loss of information?
...l numeric
values, as.numeric(levels(f))[f] is
recommended and slightly more
efficient than
as.numeric(as.character(f)).
The FAQ on R has similar advice.
Why is as.numeric(levels(f))[f] more efficent than as.numeric(as.character(f))?
as.numeric(as.character(f)) is effectively as.numeric...
How can I make one python file run another? [duplicate]
...
There are more than a few ways. I'll list them in order of inverted preference (i.e., best first, worst last):
Treat it like a module: import file. This is good because it's secure, fast, and maintainable. Code gets reused as it's su...
javascript set a variable if undefined
...
I'm surprised this pattern isn't included in more JS libs.
– joemaller
Feb 15 '13 at 19:25
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