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Fast way of counting non-zero bits in positive integer
...me:
counts = bytes(bin(x).count("1") for x in range(256)) # py2: use bytearray
Or just define it literally:
counts = (b'\x00\x01\x01\x02\x01\x02\x02\x03\x01\x02\x02\x03\x02\x03\x03\x04'
b'\x01\x02\x02\x03\x02\x03\x03\x04\x02\x03\x03\x04\x03\x04\x04\x05'
b'\x01\x02\x02\x03\x0...
How to get file_get_contents() to work with HTTPS?
...xtension_loaded ('openssl') ? 'yes':'no', "\n";
echo 'http wrapper: ', in_array('http', $w) ? 'yes':'no', "\n";
echo 'https wrapper: ', in_array('https', $w) ? 'yes':'no', "\n";
echo 'wrappers: ', var_export($w);
the output should be something like
openssl: yes
http wrapper: yes
https wrapper: y...
Way to go from recursion to iteration
...n stack. Here's a recursive quicksort function in C:
void quicksort(int* array, int left, int right)
{
if(left >= right)
return;
int index = partition(array, left, right);
quicksort(array, left, index - 1);
quicksort(array, index + 1, right);
}
Here's how we could mak...
Why does (0 < 5 < 3) return true?
...0. This technique might be viewed as a quirk or a trick in Java, but in an array or functional language may be idiomatic.
A classic example in the array language APL would be to count the number of items in an array that are (say) greater than 100:
+/A>100
Where if A is the 5 item array 107 ...
Should functions return null or an empty object?
...
If your return type is an array then return an empty array otherwise return null.
share
answered Oct 26 '0...
Use JNI instead of JNA to call native code?
...some situations will perform worse than with JNI. For example when passing arrays, JNA will convert these from Java to native at the beginning of each function call and back at the end of the function call. With JNI, you can control yourself when a native "view" of the array is generated, potentiall...
How do I parse JSON with Ruby on Rails? [duplicate]
..., see it's a String and try decoding it.
Similarly, if you have a hash or array you want serialized, use:
JSON[array_of_values]
Or:
JSON[hash_of_values]
And JSON will serialize it. You can also use the to_json method if you want to avoid the visual similarity of the [] method.
Here are some...
(![]+[])[+[]]… Explain why this works
...rand of the Addition operator is ![] and it will produce false, because an array object—as any other Object instance—is truthy, and applying the Logical (!) NOT unary operator, it produces the value false, for example.
![]; // false, it was truthy
!{}; // false, it was truthy
!0; // true, it w...
In Python, how do I index a list with another list?
...xtended slicing like that:
>>> import numpy
>>> a=numpy.array(['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'])
>>> Idx = [0, 3, 7]
>>> a[Idx]
array(['a', 'd', 'h'],
dtype='|S1')
...and is probably much faster (if performance is enough of a concern to to bother ...
Detecting if an NSString contains…?
...
how can i get the locations when i use this method on an array?
– judge
Mar 9 '14 at 22:25
Depends w...