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Why exactly is eval evil?
I know that Lisp and Scheme programmers usually say that eval should be avoided unless strictly necessary. I’ve seen the same recommendation for several programming languages, but I’ve not yet seen a list of clear arguments against the use of eval . Where can I find an account of the potentia...
When should one use final for method parameters and local variables?
... references ( for example ) that suggest using final as much as possible and I'm wondering how important that is. This is mainly in the the context of method parameters and local variables, not final methods or classes. For constants, it makes obvious sense.
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How do I implement basic “Long Polling”?
...n find lots of information on how Long Polling works (For example, this , and this ), but no simple examples of how to implement this in code.
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Haskell: Lists, Arrays, Vectors, Sequences
I'm learning Haskell and read a couple of articles regarding performance differences of Haskell lists and (insert your language)'s arrays.
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How to delete every other line in Vim?
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You can use a macro for this. Do the following.
Start in command mode.
Go to the beginning of the file by pressing gg.
Press qq.
Click arrow down and press dd after.
Press q.
Press 10000@q
PS: To go to command mode just press Escape a couple of times.
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Python list subtraction operation
...set(x) - set(y))
>>> z
[0, 8, 2, 4, 6]
Or you might just have x and y be sets so you don't have to do any conversions.
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Has anyone used Coffeescript for a production application? [closed]
...ly an app for browsing certain kinds of data.
We use CoffeeScript as a command-line compiler (not on the server, which we'd eventually like to do).
PROS (for us):
It gets rid of a lot of needless clutter in javascript (eg braces, semi-colons, some brackets) to the extent that the code is cleaner ...
What's a good rate limiting algorithm?
...hon. I am trying to implement a rate-limiting queue for a Python IRC bot, and it partially works, but if someone triggers less messages than the limit (e.g., rate limit is 5 messages per 8 seconds, and the person triggers only 4), and the next trigger is over the 8 seconds (e.g., 16 seconds later),...
UIView Infinite 360 degree rotation animation?
I'm trying to rotate a UIImageView 360 degrees, and have looked at several tutorials online. I could get none of them working, without the UIView either stopping, or jumping to a new position.
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Why is Java's boolean primitive size not defined?
... uses a 32-bit stack cell, used to hold local variables, method arguments, and expression values. Primitives that are smaller than 1 cell are padded out, primitives larger than 32 bits (long and double) take 2 cells. This technique minimizes the number of opcodes, but does have some peculiar side-ef...