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Python Empty Generator Function
...should go to Unutbu for giving the first correct version of this answer.)
Now, you may find the above clearer, but I can imagine situations in which it would be less clear. Consider this example of a long list of (contrived) generator function definitions:
def zeros():
while True:
yiel...
Why doesn't os.path.join() work in this case?
... is better than implicit." And it is. Language designers may believe they know better, but there exist obvious and demonstrably safe reasons to occasionally want to do this. Now we can't. This is why we can't have good things.
– Cecil Curry
Aug 18 '15 at 5:54
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Do AJAX requests retain PHP Session info?
... (<-- see e.g. the topmost comment there) is a separate question, let's now stick to the current one, with just one side-note: the most prominent issue with URL-based sessions -- the blatant visibility of the naked session ID -- is not an issue with internal Ajax calls; but then, if it's turned o...
Finding index of character in Swift String
... Any other indices can be created using successor or predecessor methods.
Now to help us with indices, there is a set of methods (functions in Swift 1.x):
Swift 4.x
let text = "abc"
let index2 = text.index(text.startIndex, offsetBy: 2) //will call succ 2 times
let lastChar: Character = text[index...
How to map and remove nil values in Ruby
...
Ruby 2.7+
There is now!
Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.ev...
Binding a WPF ComboBox to a custom list
...k, although with some inefficiencies, but advanced features may encounter known bugs. Consider using a derived class to avoid these problems.
Edit2 (.NET 4.5): The content of the DropDownList can be based on ToString() and not of DisplayMemberPath, while DisplayMemberPath specifies the member for ...
file_put_contents - failed to open stream: Permission denied
...
There is now a troubleshooting checklist for this kind of problems : stackoverflow.com/questions/36577020/…
– Vic Seedoubleyew
Aug 20 '16 at 9:26
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Are HLists nothing more than a convoluted way of writing tuples?
...tions for HLists is abstracting over arity. Arity is typically statically known at any given use site of an abstraction, but varies from site to site. Take this, from shapeless's examples,
def flatten[T <: Product, L <: HList](t : T)
(implicit hl : HListerAux[T, L], flatten : Flatten[L]) : ...
How do I declare an array of weak references in Swift?
...lt;T>(&object) can change randomly (same with withUnsafePointer). I now use a version backed by a NSHashTable: gist.github.com/simonseyer/cf73e733355501405982042f760d2a7d.
– simonseyer
Feb 27 '18 at 15:42
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Why can't I define a default constructor for a struct in .NET?
...n C# is "the default value for any type can't rely on any initialization". Now they could have allowed parameterless constructors to be defined, but then not required that constructor to be executed in all cases - but that would have led to more confusion. (Or at least, so I believe the argument goe...