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Why use a prime number in hashCode?
...
104
Because you want the number you are multiplying by and the number of buckets you are inserting i...
How to Compare Flags in C#?
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In .NET 4 there is a new method Enum.HasFlag. This allows you to write:
if ( testItem.HasFlag( FlagTest.Flag1 ) )
{
// Do Stuff
}
which is much more readable, IMO.
The .NET source indicates that this performs the same logic a...
How to show all shared libraries used by executables in Linux?
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274
Use ldd to list shared libraries for each executable.
Cleanup the output
Sort, compute counts, ...
How does java do modulus calculations with negative numbers?
Am I doing modulus wrong? Because in Java -13 % 64 is supposed to evaluate to -13 but I get 51 .
14 Answers
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Is there a performance difference between a for loop and a for-each loop?
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From Item 46 in Effective Java by Joshua Bloch :
The for-each loop, introduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
...
How to properly assert that an exception gets raised in pytest?
...==================================
platform linux2 -- Python 2.7.6 -- py-1.4.26 -- pytest-2.6.4
collected 7 items
test.py ..FF..F
=================================================================================================== FAILURES ==========================================================...
What does the restrict keyword mean in C++?
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143
In his paper, Memory Optimization, Christer Ericson says that while restrict is not part of the...
Elements order in a “for (… in …)” loop
... left undefined by the ECMAScript specification.
In ECMA-262, section 12.6.4:
The mechanics of enumerating the properties ... is implementation dependent.
However, specification is quite different from implementation. All modern implementations
of ECMAScript iterate through object properties in th...
Why are Python lambdas useful? [closed]
...ions to do stuff. Example:
mult3 = filter(lambda x: x % 3 == 0, [1, 2, 3, 4, 5, 6, 7, 8, 9])
sets mult3 to [3, 6, 9], those elements of the original list that are multiples of 3. This is shorter (and, one could argue, clearer) than
def filterfunc(x):
return x % 3 == 0
mult3 = filter(filterfu...
What's the common practice for enums in Python? [duplicate]
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4 Answers
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