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Why is “while ( !feof (file) )” always wrong?
...Many properties of state simply don't exist concurrently.
Let me make this more precise: Suppose you want to ask, "do you have more data". You could ask this of a concurrent container, or of your I/O system. But the answer is generally unactionable, and thus meaningless. So what if the container say...
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 ...
Android Endless List
... list where when you reach the end of the list I am notified so I can load more items?
10 Answers
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What is the difference between RDF and OWL? [closed]
...s. It is also used to indicate that a class or property is a sub-type of a more general type. For example "HumanParent" is a subclass of "Person". "Loves" is a sub-class of "Knows".
RDF Serialisations
RDF can be exported in a number of file formats. The most common is RDF+XML but this has some wea...
How can I benchmark JavaScript code? [closed]
...te mine, but I can't because it has been selected by the OP. There is much more to benchmarking than just running many iterations, and JSPerf takes care of that for you.
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C# vs C - Big performance difference
...you abandon any notion of languages being "faster" than each others. C# no more has a speed than English does.
There are certain things in the C language that would be efficient even in a naive non-optimizing compiler, and there are others that relies heavily on a compiler to optimize everything aw...
Why is lazy evaluation useful?
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Mostly because it can be more efficient -- values don't need to be computed if they're not going to be used. For example, I may pass three values into a function, but depending on the sequence of conditional expressions, only a subset may actually be...
Hide html horizontal but not vertical scrollbar
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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...
Negative weights using Dijkstra's Algorithm
... Your algorithm thus fails to accurately compute distances in some cases. Moreover, even if you were to store back pointers saying how to get from each node to the start node A, you'd end taking the wrong path back from C to A.
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