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Why is Scala's immutable Set not covariant in its type?
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Set is invariant in its type param>me m>ter because of the concept behind sets as functions. The following signatures should clarify things slightly:
trait Set[A] extends (A=>Boolean) {
def apply(e: A): Boolean
}
If Set were covariant in A, the apply m>me m>t...
Converting newline formatting from Mac to Windows
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The sed command for UNIX to DOS does not work for m>me m> on OS X Lion - it just inserts the text "r" at the end of each line. The perl command works though.
– Ergwun
May 18 '12 at 6:59
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Disable a m>me m>thod in a ViewSet, django-rest-fram>me m>work
ViewSets have automatic m>me m>thods to list, retrieve, create, update, delete, ...
7 Answers
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Automating “enter” keypresses for bash script generating ssh keys
...e script, which simply runs ssh-keygen -t rsa . But how to pass to it 3 tim>me m>s enter?
5 Answers
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Create Directory if it doesn't exist with Ruby
... to use FileUtils, you may do system call (update from @mu is too short comm>me m>nt):
> system 'mkdir', '-p', 'foo/bar' # worse version: system 'mkdir -p "foo/bar"'
=> true
But that seems (at least to m>me m>) as worse approach as you are using external 'tool' which may be unavailable on som>me m> system...
Write to UTF-8 file in Python
...code string. I suspect the file handler is trying to guess what you really m>me m>an based on "I'm m>me m>ant to be writing Unicode as UTF-8-encoded text, but you've given m>me m> a byte string!"
Try writing the Unicode string for the byte order mark (i.e. Unicode U+FEFF) directly, so that the file just encodes t...
How to split a string in shell and get the last field
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If i want to get the last elem>me m>nt from path, how should I use it? echo ${pwd##*/} does not work.
– Putnik
Feb 11 '16 at 22:33
2
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Validate phone number with JavaScript
I found this code in som>me m> website, and it works perfectly. It validates that the phone number is in one of these formats:
(123) 456-7890 or 123-456-7890
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Resuming git-svn clone
...bout 6 hours of importing (it's a big repo), my computer went and slept on m>me m>. Is there a way to resum>me m> the operation without redoing all of the initial work?
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Warning: The Copy Bundle Resources build phase contains this target's Info.plist file
...ase as shown in Figure
The INFOPLIST_FILE build setting specifies the nam>me m> of the Info.plist associated with your target. When building a target, Xcode reads this build setting and copies the referenced Info.plist into your application bundle. Because Xcode automatically processes the Info.plist,...