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Rollback to an old Git commit in a public repo
...is:
git checkout [revision] .
where [revision] is the commit hash (for example: 12345678901234567890123456789012345678ab).
Don't forget the . at the end, very important. This will apply changes to the whole tree. You should execute this command in the git project root. If you are in any sub dir...
Combining multiple git repositories
...cp -r phd phd-backup
Move the content of phd/code to phd/code/code, and fix the history so that it looks like it has always been there (this uses git's filter-branch command):
$ cd phd/code
$ git filter-branch --index-filter \
'git ls-files -s | sed "s#\t#&code/#" |
GIT_INDEX_FILE=$GI...
Django - How to rename a model field using South?
...going to use this, make sure "app_foo" is the database table name, so for example: "mainapp_profile", "name" is the old column name of the database (not the model field name), for example: "user_id" and "full_name" would be the new name you want the column to have (again, database column and not fie...
How to test code dependent on environment variables using JUnit?
...le() {
String value = withEnvironmentVariable("name", "value")
.execute(() -> System.getenv("name"));
assertEquals("value", value);
}
}
For Java 5 to 7 the library System Rules has a JUnit rule called EnvironmentVariables.
import org.junit.contrib.java.lang.system.EnvironmentVari...
Why is there a `null` value in JavaScript?
In JavaScript, there are two values which basically say 'I don't exist' - undefined and null .
12 Answers
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Visual Studio 64 bit?
...
For numerous reasons, No.
Why is explained in this MSDN post.
First, from a performance perspective the pointers get larger, so data
structures get larger, and the processor cache stays the same size.
That basically results in a raw speed hit (your mileage m...
How to properly seed random number generator
... for all pseudo-random libraries, you have to set the seed only once, for example when initializing your program unless you specifically need to reproduce a given sequence (which is usually only done for debugging and unit testing).
After that you simply call Intn to get the next random integer.
M...
How do I list loaded plugins in Vim?
...imilar Vim commands, is that they display information in a large slab of text, which is very hard to visually parse.
To get around this, I wrote Headlights, a plugin that adds a menu to Vim showing all loaded plugins, TextMate style. The added benefit is that it shows plugin commands, mappings, fil...
Salting Your Password: Best Practices?
... been curious... Which is better when salting a password for hashing: prefix, or postfix? Why? Or does it matter, so long as you salt?
...
jQuery: Difference between position() and offset()
...
Whether they're the same depends on context.
position returns a {left: x, top: y} object relative to the offset parent
offset returns a {left: x, top: y} object relative to the document.
Obviously, if the document is the offset parent, which is often the case,...