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Difference between len() and .__len__()?

... object's __len__ method. __something__ attributes are special and usually more than meets the eye, and generally should not be called directly. It was decided at some point long ago getting the length of something should be a function and not a method code, reasoning that len(a)'s meaning would be...
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Is ServiceLocator an anti-pattern?

...onstructor injection). And the problem will be still there. There are two more serious problems: With service location you are also adding another dependency: The service locator. How do you tell which lifetime the dependencies should have, and how/when they should get cleaned up? With construct...
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How do I discard unstaged changes in Git?

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npm ERR cb() never called

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Is using 'var' to declare variables optional? [duplicate]

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Why can I access private variables in the copy constructor?

...t the copy constructor either - a great many operations can involve two or more instances of your class: if you're comparing, adding/multiplying/dividing, copy-constructing, cloning, assigning etc. then it's often the case that you either simply must have access to private and/or protected data in t...
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Data structure: insert, remove, contains, get random element, all at O(1)

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What is Haskell used for in the real world? [closed]

...ntagesOfFunctionalProgramming): Functional programs tend to be much more terse than their ImperativeLanguage counterparts. Often this leads to enhanced programmer productivity FP encourages quick prototyping. As such, I think it is the best software design paradigm for ExtremeProgrammers....
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Is it bad practice to use Reflection in Unit testing? [duplicate]

...in code which, apart from being harder to understand and maintain, is also more fragile. There are a whole set of errors which in the normal case would be detected by the compiler, but with Reflection they crop up as runtime exceptions only. Update: as @tackline noted, this concerns only using Refl...
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Interview questions: WPF Developer [closed]

...No questions, just see what their code is like after a couple of hours (or more if the task is longer). I have had a zero failure rate on making a hiring descision based on the results of an actual real life programming test. The task doesn't have to be too difficult. I've used a simple message of...