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Why is whitespace sometimes needed around metacharacters?
...s ago I tattooed a fork bomb on my arm, and I skipped the whitespaces, because I think it looks nicer without them. But to my dismay, sometimes (not always) when I run it in a shell it doesn't start a fork bomb, but it just gives a syntax error.
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Under what conditions is a JSESSIONID created?
...is created/sent when session is created. Session is created when your code calls request.getSession() or request.getSession(true) for the first time. If you just want to get the session, but not create it if it doesn't exist, use request.getSession(false) -- this will return you a session or null. I...
What exactly do the Vagrant commands do?
... that documentation at vagrantup is on the shorter side.
Some information can be gleaned from command help system.
For example: gem command.
Just type the command without arguments: vagrant gem -h and it produces the information that you may need.
vagrant gem is used to install Vagrant plugi...
What's the difference between ngModel.$modelValue and ngModel.$viewValue
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So basically, $viewValue is always a string?
– cdmckay
Mar 7 '14 at 1:40
7
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Turn off constraints temporarily (MS SQL)
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You can disable FK and CHECK constraints only in SQL 2005+. See ALTER TABLE
ALTER TABLE foo NOCHECK CONSTRAINT ALL
or
ALTER TABLE foo NOCHECK CONSTRAINT CK_foo_column
Primary keys and unique constraints can not be disabled,...
What is the recommended batch size for SqlBulkCopy?
...ommended batch size for SqlBulkCopy ? I'm looking for a general formula I can use as a starting point for performance tuning.
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Haskell: Where vs. Let
...y
where y = ... x ...
is the parameter x. Things in the where clause can refer only to the parameters of the function f (there are none) and things in outer scopes.
2: To use a where in the first example, you can introduce a second named function
that takes the x as a parameter, like this:
f...
Where does the “flatmap that s***” idiomatic expression in Scala come from?
What is so powerful about flatmap that it deserves such a place in the Scala folklore?
4 Answers
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Joda-Time: what's the difference between Period, Interval and Duration?
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3 classes are needed because they represent different concepts so it is a matter of picking the appropriate one for the job rather than of relative performance. From the documentation with comments added by me in italics:
An interval in Joda-Tim...
java: Class.isInstance vs Class.isAssignableFrom
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this misses the case where the Foo is the same as clazz - in which case it returns true: Pauls top-voted answer below corrects this
– Rhubarb
Mar 21 '13 at 14:18
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