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Why em instead of px?

...something else like the size of the browser window or the font size. Like all the other absolute units, px units don't scale according to the width of the browser window. Thus, if your entire page design uses absolute units such as px rather than %, it won't adapt to the width of the browser. This...
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Recommended way to save uploaded files in a servlet application

...e server's work folder get synced with last updates (this is in IDE terms called "publishing"). This is the main cause of the problem you're seeing. In real world code there are circumstances where storing uploaded files in the webapp's deploy folder will not work at all. Some servers do (either by...
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Enum type constraints in C# [duplicate]

What is the reason behind C# not allowing type constraints on Enum 's? I'm sure there is a method behind the madness, but I'd like to understand why it's not possible. ...
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How to remove multiple indexes from a list at the same time? [duplicate]

...t-in operation to remove a number of indexes at once. Your example is actually a contiguous sequence of indexes, so you can do this: del my_list[2:6] which removes the slice starting at 2 and ending just before 6. It isn't clear from your question whether in general you need to remove an arbitr...
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Is it possible to use 'else' in a list comprehension? [duplicate]

..., 2, 3] So for your example, table = ''.join(chr(index) if index in ords_to_keep else replace_with for index in xrange(15)) share | improve this answer | ...
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Using Auto Layout in UITableView for dynamic cell layouts & variable row heights

...each cell's content and subviews determine the row height (itself/automatically), while maintaining smooth scrolling performance? ...
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O(nlogn) Algorithm - Find three evenly spaced ones within binary string

... Finally! Following up leads in sdcvvc's answer, we have it: the O(n log n) algorithm for the problem! It is simple too, after you understand it. Those who guessed FFT were right. The problem: we are given a binary string S of l...
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Does ruby have real multithreading?

...ing models. (Unfortunately, only two of those 11 implementations are actually ready for production use, but by the end of the year that number will probably go up to four or five.) (Update: it's now 5: MRI, JRuby, YARV (the interpreter for Ruby 1.9), Rubinius and IronRuby). The first implement...
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ASP.NET MVC Relative Paths

...ten have to use relative paths. For example, when I reference JQuery, I usually do so like this: 11 Answers ...
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Performance optimization strategies of last resort [closed]

...erformance questions on this site already, but it occurs to me that almost all are very problem-specific and fairly narrow. And almost all repeat the advice to avoid premature optimization. ...