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Why exactly is eval evil?
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There are several reasons why one should not use EVAL.
The main reason for beginners is: you don't need it.
Example (assuming Common Lisp):
EVALuate an expression with different operators:
(let ((ops '(+ *)))
(dolist (op ops)
(print (eval (list op 1...
What are free monads?
...erm Free Monad pop up every now and then for some time, but everyone just seems to use/discuss them without giving an explanation of what they are. So: what are free monads? (I'd say I'm familiar with monads and the Haskell basics, but have only a very rough knowledge of category theory.)
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How to create empty text file from a batch file?
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To merge ephemient's answer and this one, you could do: "echo. >NUL 2>EmptyFile.txt" to achieve the same results without outputting a newline
– cmptrgeekken
Oct 25 '09 at 15:34
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How can I run an external command asynchronously from Python?
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Cdleary is absolutely correct, it should be mentioned that communicate and wait do block, so only do it when you are waiting for things to shut down. (Which you should really do to be well-behaved)
– Ali Afshar
Mar 11 '09 at 22:29
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How to break out from a ruby block?
...is in a loop without terminating the loop. To do that, I made the block a one-iteration loop:
for b in 1..2 do
puts b
begin
puts 'want this to run'
break
puts 'but not this'
end while false
puts 'also want this to run'
end
Hope this helps the next googler ...
MySQL case insensitive select
Can anyone tell me if a MySQL SELECT query is case sensitive or case insensitive by default? And if not, what query would I have to send so that I can do something like:
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Finding local maxima/minima with Numpy in a 1D numpy array
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Thank you, this is one of the best solutions I have found so far
– Noufal E
May 13 at 13:15
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javax vs java package
...: While an official explanation (the search orbfish suggested didn't yield one in the first page or so) is no doubt about "core" vs "extension", I still suspect that in many cases the decision for any particular package has an historical reason behind it too. Is java.beans really that "core" to Java...
What is the need of JSF, when UI can be achieved with JavaScript libraries such as jQuery and Angula
I was reading about JSF that its a UI framework and provides some UI components. But how is it better or different from number of components that are available from jQueryUI, AngularJS, ExtJS, or even plain HTML, CSS and JavaScript.
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How can I debug git/git-shell related problems?
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There are a few GIT_TRACE options, beyond the core one. Here's the über-verbose option: set -x; GIT_TRACE=2 GIT_CURL_VERBOSE=2 GIT_TRACE_PERFORMANCE=2 GIT_TRACE_PACK_ACCESS=2 GIT_TRACE_PACKET=2 GIT_TRACE_PACKFILE=2 GIT_TRACE_SETUP=2 GIT_TRACE_SHALLOW=2 git pull origin master...