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Why can't I declare static methods in an interface?
...don't know which implementing class is the correct definition.
Java could allow the latter; and in fact, starting in Java 8, it does!
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Make .gitignore ignore everything except a few files
...han the root dir won't be found anyway. I'm using this now (with *.pl) and all *.pl files are being ignored even though there are many in the subdirectories below the .gitignore file
– PandaWood
Nov 6 '11 at 1:44
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Why does my 'git branch' have no master?
... branch name). So if the repository you cloned had a HEAD pointed to, say, foo, then your clone will just have a foo branch.
The remote you cloned from might still have a master branch (you could check with git ls-remote origin master), but you wouldn't have created a local version of that branch b...
How to exclude a directory in find . command
I'm trying to run a find command for all JavaScript files, but how do I exclude a specific directory?
38 Answers
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How can I avoid running ActiveRecord callbacks?
I have some models that have after_save callbacks. Usually that's fine, but in some situations, like when creating development data, I want to save the models without having the callbacks run. Is there a simple way to do that? Something akin to...
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Replacing blank values (white space) with NaN in pandas
I want to find all values in a Pandas dataframe that contain whitespace (any arbitrary amount) and replace those values with NaNs.
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Subclassing a Java Builder class
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You can solve it using generics. I think this is called the "Curiously recurring generic patterns"
Make the return type of the base class builder methods a generic argument.
public class NutritionFacts {
private final int calories;
public static class Builder<...
Should unit tests be written for getter and setters?
...or handling isn't covered by unit tests it will never be covered. Do you really want to ship a product that contains code that has never ever been run?
– Anders Abel
Jun 1 '11 at 19:10
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How can I check if a command exists in a shell script? [duplicate]
... script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
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Add a new element to an array without specifying the index in Bash
...[@]}]}
h
Here's how to get the last index:
$ end=(${!array[@]}) # put all the indices in an array
$ end=${end[@]: -1} # get the last one
$ echo $end
42
That illustrates how to get the last element of an array. You'll often see this:
$ echo ${array[${#array[@]} - 1]}
g
As you can see, be...