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How to debug Ruby scripts [closed]
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For a new Ruby/Rails application, Pry is the correct answer. But I spent over an hour trying to find an ancient version of Pry to run on a Rails 2.2 app with a specific version of facets in the gem requirements, and was unsuccessful. For ancien...
How many GCC optimization levels are there?
...lear on the man page.
We shall conclude that:
anything above -O3 up to INT_MAX is the same as -O3, but that could easily change in the future, so don't rely on it.
GCC 5.1 runs undefined behavior if you enter integers larger than INT_MAX.
the argument can only have digits, or it fails gracefully. I...
Understanding garbage collection in .NET
...top the GC from being to over-eager with collecting a reference, that can happen in interop scenarios where a reference is passed to unmanaged code. The garbage collector cannot see such references being used by such code since it wasn't compiled by the jitter so doesn't have the table that says wh...
SourceKitService Terminated
...just enhancement of answer.. create a shell script and run it whenever it happens rm -frd ~/Library/Developer/Xcode/DerivedData/* rm -frd ~/Library/Caches/com.apple.dt.Xcode/*
– Raj
Jan 24 '15 at 9:41
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Regular Expression for alphanumeric and underscores
...that contains only those characters (or an empty string), try
"^[a-zA-Z0-9_]*$"
This works for .NET regular expressions, and probably a lot of other languages as well.
Breaking it down:
^ : start of string
[ : beginning of character group
a-z : any lowercase letter
A-Z : any uppercase letter
0-...
Convert all first letter to upper case, rest lower for each word
....Thread.CurrentThread.CurrentCulture.TextInfo.ToTitleCase(s.ToLower());
IL_0000: ldstr "THIS IS MY TEXT RIGHT NOW"
IL_0005: stloc.0 // s
IL_0006: call System.Threading.Thread.get_CurrentThread
IL_000B: callvirt System.Threading.Thread.get_CurrentCulture
IL_0010: callvirt ...
Scala: List[Future] to Future[List] disregarding failed futures
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def futureToFutureTry[T](f: Future[T]): Future[Try[T]] =
f.map(Success(_)).recover { case x => Failure(x)}
val listOfFutures = ...
val listOfFutureTrys = listOfFutures.map(futureToFutureTry(_))
Then use Future.sequence as before, to give you a Future[List[Try[T]]]
val futureListOfTrys = F...
How can I time a code segment for testing performance with Pythons timeit?
...e and after the block you want to time.
import time
t0 = time.time()
code_block
t1 = time.time()
total = t1-t0
This method is not as exact as timeit (it does not average several runs) but it is straightforward.
time.time() (in Windows and Linux) and time.clock() (in Linux) are not precise eno...
How are Python's Built In Dictionaries Implemented?
...keys' hashes. You can think of it like this:
hash key dict_0 dict_1 dict_2...
...010001 ffeb678c 633241c4 fffad420 ...
... ... ... ... ...
For a 64 bit machine, this could save up to 16 bytes per key per extra dictionary.
Shared Keys for...
How to get the URL of the current page in C# [duplicate]
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AbsolutePath appears to return "/" in .NET 3.5 (haven't tested other versions) for paths similar to twitter user accounts, such as twitter.com/#!/user. You can use the Fragment method to get anything after the pound (#).
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