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Remove blank lines with grep
...explain. For instance your regular expression matches the beginning of the string then one or more spaces using the POSIX standard then the end of the string, i.e. with grep -v it removes all lines that are only spaces. Right? What happens if there are no spaces; it's simply a newline character?
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Convert a date format in PHP
... date function requires a timestamp, and I can't get a timestamp from this string.
17 Answers
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How to check if a Ruby object is a Boolean
...t is less cryptic in intent than the !!foo == foo.
– stringsn88keys
Nov 14 '17 at 19:38
Downright pythonic! Definitely...
How to choose the id generation strategy when using JPA and Hibernate
...quence.
uuid
uses a 128-bit UUID algorithm to generate identifiers of type string that are unique within a network (the IP address is used). The UUID is encoded as a string of 32 hexadecimal digits in length.
guid
uses a database-generated GUID string on MS SQL Server and MySQL.
native
selects ident...
How do I run only specific tests in Rspec?
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You can run all tests that contain a specific string with --example (or -e) option:
rspec spec/models/user_spec.rb -e "User is admin"
I use that one the most.
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convert UIImage to NSData
... UIImage *snapshot = self.myImageView.image;
[self encodeImageToBase64String:snapshot];
}
call this method for image convert in base 64
-(NSString *)encodeImageToBase64String:(UIImage *)image
{
return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataB...
How to decompile an APK or DEX file on Android platform? [closed]
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DecompileAndroid unfortunately doesn't decompile strings.xml correctly
– goRGon
Feb 5 '15 at 19:50
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Create directory if it does not exist
...emp\
}
The first line creates a variable named $path and assigns it the string value of "C:\temp\"
The second line is an If statement which relies on the Test-Path cmdlet to check if the variable $path does not exist. The not exists is qualified using the ! symbol.
Third line: If the path stored ...
Replace \n with actual new line in Sublime Text
... appear to be working, you might want to try replacing \n with your target string -- \\n replaces the actual sequence "\n" in the text content within your document, whereas \n replaces actual line breaks in the document.
– duhaime
Feb 18 '19 at 14:52
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When is -XAllowAmbiguousTypes appropriate?
...stances, OverlappingInstances #-}
class Foo a where
whichOne :: a -> String
instance Foo a where
whichOne _ = "a"
instance Foo [a] where
whichOne _ = "[a]"
-- |
-- >>> main
-- [a]
main :: IO ()
main = putStrLn $ whichOne (undefined :: [Int])
But GHC is not okay with overlappi...