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What belongs in an educational tool to demonstrate the unwarranted assumptions people make in C/C++?

...e to prepare a little educational tool for SO which should help beginners (and intermediate) programmers to recognize and challenge their unwarranted assumptions in C, C++ and their platforms. ...
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How do I know which version of Javascript I'm using?

...r versions) Mozilla progresses with every dot release (they maintain the standard so that's not surprising) Firefox 4 is on JavaScript 1.8.5 The other big off-the-beaten-path one is IE9 - it implements ECMAScript 5, but doesn't implement all the features of JavaScript 1.8.5 (not sure what they're c...
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Can I use CASE statement in a JOIN condition?

.... From the image we can see that the relationship between sys.partitions and sys.allocation_units depends on the value of sys.allocation_units.type . So to join them together I would write something similar to this: ...
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Why are there two kinds of functions in Elixir?

I'm learning Elixir and wonder why it has two types of function definitions: 8 Answers ...
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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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How do I check if a string is a number (float)?

... Which, not only is ugly and slow I'd dispute both. A regex or other string parsing method would be uglier and slower. I'm not sure that anything much could be faster than the above. It calls the function and returns. Try/Catch doesn't introd...
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Check if table exists without using “select from”

Is there a way to check if a table exists without selecting and checking values from it? 17 Answers ...
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ASP.NET Identity's default Password Hasher - How does it work and is it secure?

...her that is default implemented in the UserManager that comes with MVC 5 and ASP.NET Identity Framework, is secure enough? And if so, if you could explain to me how it works? ...
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Random alpha-numeric string in JavaScript? [duplicate]

What's the shortest way (within reason) to generate a random alpha-numeric (uppercase, lowercase, and numbers) string in JavaScript to use as a probably-unique identifier? ...
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Why is there no xrange function in Python3?

Recently I started using Python3 and it's lack of xrange hurts. 6 Answers 6 ...