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What is move semantics?
...cott Meyers regarding C++0x . Most of the new features made sense to me, and I am actually excited about C++0x now, with the exception of one. I still don't get move semantics ... What is it exactly?
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Replace values in list using Python [duplicate]
...ns ± 13.6 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)
And Python 2.7.6 timings:
In [1]: %%timeit
...: items = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
...: for index, item in enumerate(items):
...: if not (item % 2):
...: items[index] = None
...:
1000000 l...
ASP.NET Identity DbContext confusion
...ay you can have the context be aware of any relations between your classes and the IdentityUser and Roles of the IdentityDbContext.
There is very little overhead in the IdentityDbContext, it is basically a regular DbContext with two DbSets. One for the users and one for the roles.
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List comprehension in Ruby
... % 2 == 0 ? x * 3 : nil}.compact
Slightly cleaner, at least to my taste, and according to a quick benchmark test about 15% faster than your version...
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What is an idempotent operation?
...g that x in the mathematical definition represents the state of an object, and f is an operation that may mutate that object. For example, consider the Python set and its discard method. The discard method removes an element from a set, and does nothing if the element does not exist. So:
my_set.dis...
variable === undefined vs. typeof variable === “undefined”
...ation marks (typeof foo; // -> "undefined") to emphasise it is a string and not the primitive value undefined.
– c24w
Apr 19 '13 at 16:06
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How to support UTF-8 encoding in Eclipse
...ered Feb 7 '12 at 17:41
Sajan ChandranSajan Chandran
10.2k22 gold badges2424 silver badges3737 bronze badges
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What is the 'pythonic' equivalent to the 'fold' function from functional programming?
...u can sometimes use some combination of reduce (from the functools module) and the operator module, e.g.:
def product(xs):
return reduce(operator.mul, xs, 1)
Be aware that reduce is actually a foldl, in Haskell terms. There is no special syntax to perform folds, there's no builtin foldr, and ...
Group By Multiple Columns
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@HoGo anonymous typed objects implement their own Equals and GetHashCode methods which is used when grouping the objects.
– Byron Carasco
Sep 7 '17 at 18:57
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Date ticks and rotation in matplotlib
...sn't do anything, plt.gca() does not give you the axes you want to modify, and so plt.xticks, which acts on the current axes, is not going to work.
For an object-oriented approach not using plt.xticks, you can use
plt.setp( axs[1].xaxis.get_majorticklabels(), rotation=70 )
after the two avail_pl...