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Rollback to last git commit
...Emptor - Destructive commands ahead.
Mitigation - git reflog can save you if you need it.
1) UNDO local file changes and KEEP your last commit
git reset --hard
2) UNDO local file changes and REMOVE your last commit
git reset --hard HEAD^
3) KEEP local file changes and REMOVE your last comm...
Correct use of flush() in JPA/Hibernate
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if flush() sends data to the database? what happens if an exception is thrown after that? Will the entity manager rollback everything? even the data written in the first flush?
– Jaime Hablutzel
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Cannot use ref or out parameter in lambda expressions
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Lambdas have the appearance of changing the lifetime of variables that they capture. For instance the following lambda expression causes the parameter p1 to live longer than the current method frame as its value can be accessed after the method frame is no longer on th...
How to convert a scala.List to a java.util.List?
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Scala List and Java List are two different beasts, because the former is immutable and the latter is mutable. So, to get from one to another, you first have to convert the Scala List into a mutable collection.
On Scala 2.7:
import scala.collection.jcl.Conve...
C/C++ macro string concatenation
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If they're both strings you can just do:
#define STR3 STR1 STR2
The preprocessor automatically concatenates adjacent strings.
EDIT:
As noted below, it's not the preprocessor but the compiler that does the concatenation.
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Is string in array?
What would be the best way to look in a string[] to see if it contains a element. This was my first shot at it. But perhaps there is something that I am overlooking. The array size will be no larger than 200 elements.
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What is the best way to check for Internet connectivity using .NET?
...y, no reason to pull the 4KB back - just use client.OpenRead(url) instead. If it doesn't throw an exception then it was able to connect.
– Josh M.
Mar 27 '11 at 16:50
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What's the state of the art in email validation for Rails?
...o maintain it. But it seems people still use it and look for improvements. If you are interested, please write me on the github project : hallelujah/valid_email
– Hallelujah
May 19 '14 at 9:01
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CSS rule to apply only if element has BOTH classes [duplicate]
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Also: .abc.xyz is more specific than .abc or .xyz or div so !important is not necessary.
– Jan
Apr 26 '11 at 21:29
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Android - Launcher Icon Size
... that they can then scale the icon down to whatever size they need on the different positions of the app and website, without causing pixelation.
– edwoollard
Jan 11 '14 at 13:53
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