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Objective-C: difference between id and void *
...dditional semantic differences:
Under GC Only or GC Supported modes, the compiler will emit write barriers for references of type id, but not for type void *. When declaring structures, this can be a critical difference. Declaring iVars like void *_superPrivateDoNotTouch; will cause premature ...
In Clojure, when should I use a vector over a list, and the other way around?
...de. Good thing answering your own questions is encouraged on Stackoverflow.com :D
I had a quick discussion with Rich Hickey, and here is the gist of it.
[12:21] <Raynes> Vectors aren't seqs, right?
[12:21] <rhickey> Raynes: no, but they are sequential
[12:21] <rhickey> ,(s...
What are all the uses of an underscore in Scala?
...tten!
Example showing why foo(_) and foo _ are different:
This example comes from 0__:
trait PlaceholderExample {
def process[A](f: A => Unit)
val set: Set[_ => Unit]
set.foreach(process _) // Error
set.foreach(process(_)) // No Error
}
In the first case, process _ represents...
Entity Framework vs LINQ to SQL
...dict while they are very similar in style using LINQ lambdas, each API has completely different underpinnings. For instance the way LINQ2SQL generates SQL queries allows for the use of SQL functions, whereas L2E does not, or at least did not as of 2008.
– Kris
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Pythonic way to check if a list is sorted or not
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A combo of a couple of the solutions: def isSorted(x, key = lambda x: x): return all([key(x[i]) <= key(x[i + 1]) for i in xrange(len(x) - 1)])
– eacousineau
Sep 27 '11 at 23:26
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Why does Java's hashCode() in String use 31 as a multiplier?
Per the Java documentation, the hash code for a String object is computed as:
13 Answers
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How to hide close button in WPF window?
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How do I make and use a Queue in Objective-C?
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I added a commented-out line at the beginning of dequeue for those that wish to return nil rather than raise an exception when trying to dequeue from an empty queue. IMO, following the NSMutableArray behavior of raising an exception is...
Sound effects in JavaScript / HTML5
...can fallback to ogg/wav. It would require some trickery in javascript to accomplish the same.
– joelmdev
Feb 9 '12 at 20:01
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UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in rang
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