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Ant task to run an Ant target only if a file exists?
...
Available and Condition
<target name="check-abc">
<available file="abc.txt" property="abc.present"/>
</target>
<target name="do-if-abc" depends="check-abc" if="abc.present">
...
</target>
...
What is Double Brace initialization in Java?
...es an anonymous class derived from the specified class (the outer braces), and provides an initialiser block within that class (the inner braces). e.g.
new ArrayList<Integer>() {{
add(1);
add(2);
}};
Note that an effect of using this double brace initialisation is that you're creating...
Open a project in a new window in IntelliJ after “accidentally” clicking remember decision
I wanted to open a new project in a separate window in IntelliJ and I "accidentally" clicked "Remember this decision and don't ask again" and clicked "open in the same window"!
...
What is the point of noreturn?
...n your example).
This can be used by compilers to make some optimizations and generate better warnings. For example if f has the noreturn attribute, the compiler could warn you about g() being dead code when you write f(); g();. Similarly the compiler will know not to warn you about missing return ...
Swapping column values in MySQL
I have a MySQL table with coordinates, the column names are X and Y. Now I want to swap the column values in this table, so that X becomes Y and Y becomes X. The most apparent solution would be renaming the columns, but I don't want to make structure changes since I don't necessarily have permission...
JQuery .on() method with multiple event handlers to one selector
...e:
$("table.planning_grid").on({
mouseenter: function() {
// Handle mouseenter...
},
mouseleave: function() {
// Handle mouseleave...
},
click: function() {
// Handle click...
}
}, "td");
...
How do I forward parameters to other command in bash script?
...script can recognize them), then forward the remaining parameters to a command invoked in the script. How can I do that?
3 ...
Git: updating remote branch information
...r remote_name/branch_name
you only remove your local checkout. This command doesn't do anything to the remote repository, which is why it still shows up.
Solution:
git push origin :branch_name
will remove the the remote branch (note the ':'), and
git branch -d branch_name
will remove your ...
python pandas remove duplicate columns
... solution to the problem. This applies if some column names are duplicated and you wish to remove them:
df = df.loc[:,~df.columns.duplicated()]
How it works:
Suppose the columns of the data frame are ['alpha','beta','alpha']
df.columns.duplicated() returns a boolean array: a True or False for e...
JavaScript: empty array, [ ] evaluates to true in conditional structures. Why is this?
...zero in quotes), "false" (false in quotes), empty functions, empty arrays, and empty objects.
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