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How to use Git Revert
...e opposite of an existing commit.
It leaves the files in the same state as if the commit that has been reverted never existed. For example, consider the following simple example:
$ cd /tmp/example
$ git init
Initialized empty Git repository in /tmp/example/.git/
$ echo "Initial text" > README.md
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On design patterns: When should I use the singleton?
The glorified global variable - becomes a gloried global class. Some say breaking object-oriented design.
19 Answers
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Timeout command on Mac OS X?
... on Mac OSx. The basic requirement is I am able to run a command for a specified amount of time.
5 Answers
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Does Java have a complete enum for HTTP response codes?
I'm wondering if there is an enum type in some standard Java class library that defines symbolic constants for all of the valid HTTP response codes. It should support conversion to/from the corresponding integer values.
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Uppercase or lowercase doctype?
...>
In XML serializations (i.e. XHTML) the DOCTYPE is not required, but if you use it, DOCTYPE should be uppercase:
<!DOCTYPE html>
See The XML serialization of HTML5, aka ‘XHTML5’:
Note that if you don’t uppercase DOCTYPE in an XHTML document, the XML parser will return a synt...
Android: When should I use a Handler() and when should I use a Thread?
...works fine.
Creating a Handler and running it works as well.
What's the difference? When should I use each one?
What are the advantages / reasons to use a Handler and not a Thread ?
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Python: How would you save a simple settings/config file?
I don't care if it's JSON , pickle , YAML , or whatever.
6 Answers
6
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How can you determine a point is between two other points on a line segment?
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Check if the cross product of (b-a) and (c-a) is 0, as tells Darius Bacon, tells you if the points a, b and c are aligned.
But, as you want to know if c is between a and b, you also have to check that the dot product of (b-a) and ...
How to replace ${} placeholders in a text file?
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Small hint: if "1" or "dog" in the given example would contain a dollar symbol, you would have to escape it with a backslash (otherwise replacement does not occur).
– MatthieuP
Jan 10 '09 at 2:35
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Add SUM of values of two LISTS into new LIST
... used with a list comprehension.
[x + y for x, y in zip(first, second)]
If you have a list of lists (instead of just two lists):
lists_of_lists = [[1, 2, 3], [4, 5, 6]]
[sum(x) for x in zip(*lists_of_lists)]
# -> [5, 7, 9]
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