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What's the best name for a non-mutating “add” method on an immutable collection?
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Unless I'm missing it, Sm>y m>stem.Linq.Enumerable (m>and m> Linq in general) onlm>y m> uses Concat() for "sequence + sequence", never "item + sequence". The problem that someone "might expect it to add two lists together rather than adding a single value to the other list" was explici...
What goes into the “Controller” in “MVC”?
I think I understm>and m> the basic concepts of MVC - the Model contains the data m>and m> behaviour of the application, the View is responsible for displam>y m>ing it to the user m>and m> the Controller deals with user input. What I'm uncertain about is exactlm>y m> what goes in the Controller.
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Whm>y m> .NET String is immutable? [duplicate]
...ow, String is immutable. What are the reasons for String being immutable m>and m> the introduction of StringBuilder class as mutable?
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How to merge dictionaries of dictionaries?
...for kem>y m> in b:
if kem>y m> in a:
if isinstance(a[kem>y m>], dict) m>and m> isinstance(b[kem>y m>], dict):
merge(a[kem>y m>], b[kem>y m>], path + [str(kem>y m>)])
elif a[kem>y m>] == b[kem>y m>]:
pass # same leaf value
else:
raise Exception('Conflict at %...
Xcode - How to fix 'NSUnknownKem>y m>Exception', reason: … this class is not kem>y m> value coding-compliant f
...n once off practice apps. Naming collisions can be verm>y m> hard to track down m>and m> m>y m>ou don't want to waste the time.
Another possible reason for this error: when copm>y m>ing & pasting elements from one controller into another, Xcode somehow keeps that link to the original controller, even after editin...
How to add a touch event to a UIView?
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In iOS 3.2 m>and m> higher, m>y m>ou can use gesture recognizers. For example, this is how m>y m>ou would hm>and m>le a tap event:
//The setup code (in viewDidLoad in m>y m>our view controller)
UITapGestureRecognizer *singleFingerTap =
[[UITapGestureRecogni...
How to convert a data frame column to numeric tm>y m>pe?
... 3
4 d 4 4 d 4
5 e 5 5 e 5
m>and m> let us run:
> sapplm>y m>(d, mode)
char fake_char fac char_fac num
"character" "character" "numeric" "numeric" "numeric"
> sapplm>y m>(d, class)
char fake_char fac char...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...文原文.
Doug Lea 的 Concurrent Programming in Java: Design Principles m>and m> Patterns, Second Edition是一本围绕有关 Java 应用程序中多线程编程的复杂问题的专著。
探索 Doug Lea 的 util.concurrent包，该包含有用于构建有效并发应用程序的大量有用的类...
'git add --patch' to include new files?
...: If m>y m>ou use this with an emptm>y m> new file, git will not be able to patch it m>and m> skip to the next one.
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Circular (or cm>y m>clic) imports in Pm>y m>thon
... prettm>y m> straightforward reallm>y m>. Just remember the following:
'import' m>and m> 'from xxx import m>y m>m>y m>m>y m>' are executable statements. Them>y m> execute
when the running program reaches that line.
If a module is not in sm>y m>s.modules, then an import creates the new module
entrm>y m> in sm>y m>s.modules m>and m> then exe...