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Sending a message to nil in Objective-C
... anything except keep the compiler happy. Yes, you get the overhead of one more method call, but you save programmer time, which is a far more expensive resource than CPU time. In addition, you're eliminating more code and more conditional complexity from your application.
Clarifying for downvoters...
Flatten list of lists [duplicate]
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Sorry, I meant more readable/intuitive. Since the OP is having trouble disambiguating between what lists are (sequences of data) and how lists are represented in code (with square brackets), I highly doubt a double list comprehension will m...
Pretty git branch graphs
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Update: This answer has gotten far more attention than it deserves. It was originally posted because I think the graphs look nice and they could be drawn-over in Illustrator for a publication– and there was no better solution. But there now exists much...
Common programming mistakes for Clojure developers to avoid [closed]
...s)) i
(recur (dec i) n times))))
When in fact loop would have been more concise and idiomatic for this particular function:
; Elapsed time: 387 msecs
(defn p3 [] {:post [(= % 6857)]}
(loop [i 775147 n 600851475143 times 3]
(if (and (divides? i n) (fast-prime? i times)) i
(recur ...
How to sum a variable by group
...h that "natural-language interpretation" of the tilde operator, it becomes more meaningful (and even intuitive). I personally find this symbolic formula representation better than some of the more verbose alternatives.
– r2evans
Dec 19 '16 at 4:35
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How do I concatenate two arrays in C#?
... @manthrax -> In its defense, C# tends to favor lists which are much more powerful than arrays. It seems the only functional purpose for using arrays is for Interop calls (Unmanaged C++).
– Levi Fuller
Oct 26 '15 at 22:40
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nonlocal keyword in Python 2.x
...ry class and instantiate object instead of the dictionary. I find it much more elegant and readable since it does not flood the code with literals (dictionary keys), plus you can make use of methods.
– Alois Mahdal
Aug 15 '13 at 13:19
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How to convert an int value to string in Go?
...ions names like "Itoa" were preferable to something that might be a little more descriptive?
– Luke
Jul 17 '16 at 20:27
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Why is using the JavaScript eval function a bad idea?
...oper use of eval opens up your
code for injection attacks
Debugging can be more challenging
(no line numbers, etc.)
eval'd code executes slower (no opportunity to compile/cache eval'd code)
Edit: As @Jeff Walden points out in comments, #3 is less true today than it was in 2008. However, while some...
How to insert element into arrays at specific position?
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