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How can you do anything useful without mutable state?

I've been reading a lot of stuff about functional programming lately, and I can understand most of it, but the one thing I just can't wrap my head around is stateless coding. It seems to me that simplifying programming by removing mutable state is like "simplifying" a car by removing the dashboard:...
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Is it possible to cache POST methods in HTTP?

With very simple caching semantics: if the parameters are the same (and the URL is the same, of course), then it's a hit. Is that possible? Recommended? ...
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Why do we use __init__ in Python classes?

I am having trouble understanding the Initialization of classes. 8 Answers 8 ...
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Why does typeof NaN return 'number'?

...eration which return NaN: Operations with a NaN as at least one operand Indeterminate forms The divisions 0/0, ∞/∞, ∞/−∞, −∞/∞, and −∞/−∞ The multiplications 0×∞ and 0×−∞ The power 1^∞ The additions ∞ + (−∞), (−∞) + ∞ and e...
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What is the official “preferred” way to install pip and virtualenv systemwide?

... If you can install the latest Python (2.7.9 and up) Pip is now bundled with it. See: https://docs.python.org/2.7//installing/index.html If not : Update (from the release notes): Beginning with v1.5.1, pip does not require setuptools prior to running get-pip.py. Ad...
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What are the default access modifiers in C#?

...ult access modifier for classes, methods, members, constructors, delegates and interfaces? 9 Answers ...
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When is it right for a constructor to throw an exception?

...hat supports one-stage construction, where the object is fully initialized and usable after construction. One-stage constructors should throw if they fail to fully initialize the object. If the object cannot be initialized, it must not be allowed to exist, so the constructor must throw. ...
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What are the best practices for SQLite on Android?

... the best practices when executing queries on an SQLite database within an Android app? 10 Answers ...
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Can “git pull --all” update all my local branches?

I often have at least 3 remote branches: master, staging and production. I have 3 local branches that track those remote branches. ...
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IE9 border-radius and background gradient bleeding

IE9 is apparently able to handle rounded corners by using the CSS3 standard definition of border-radius . 17 Answers ...