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Rotating a two-dimensional array in Python
... 2]]
This list is passed into zip() using argument unpacking, so the zip call ends up being the equivalent of this:
zip([3, 4],
[1, 2])
# ^ ^----column 2
# |-------column 1
# returns [(3, 1), (4, 2)], which is a original rotated clockwise
Hopefully the comments make it clear what zip...
How to get all properties values of a JavaScript Object (without knowing the keys)?
...n for you:
for (var key in obj) {
if (Object.prototype.hasOwnProperty.call(obj, key)) {
var val = obj[key];
// use val
}
}
The nested if makes sure that you don't enumerate over properties in the prototype chain of the object (which is the behaviour you almost certainly wa...
What is the relation between BLAS, LAPACK and ATLAS
...d gfortran). I have made MakeFiles which you can read to learn how you can call individual Fortran/FORTRAN routines in a C or C++ program. I have also put some installations instructions for mac and linux (sorry windows guys!). I have also made some bash .sh files for automatic compilation of some o...
Get query from java.sql.PreparedStatement [duplicate]
...'re lucky, the JDBC driver in question may return the complete SQL by just calling PreparedStatement#toString(). I.e.
System.out.println(preparedStatement);
To my experience, the ones which do so are at least the PostgreSQL 8.x and MySQL 5.x JDBC drivers. For the case your JDBC driver doesn't sup...
Is there a Null OutputStream in Java?
... all bytes. The returned stream is initially open. The stream is closed by calling the close() method. Subsequent calls to close() have no effect.
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When should you branch?
... specific as "let's fix bug 23"),
not to isolate a "resource".
(a branch called "VonC" means nothing to another developer: What if "VonC" leaves the project? What are you supposed to do with it?
a branch called "bugfix_212" can be interpreted in the context of a bug tracking system for instance, a...
In a Bash script, how can I exit the entire script if a certain condition occurs?
...e the function without existing the shell, but without making the function caller care for the correct check of the return code of the function?
– jan
Dec 11 '18 at 9:15
...
How to get current location in Android [duplicate]
...need to write code in the OnLocationChanged method, because this method is called when the location has changed. I.e. you need to save the new location to return it if getLocation is called.
If you don't use the onLocationChanged it always will be the old location.
...
How to skip over an element in .map()?
..., the code in the .filter() from the first sample is part of the .reduce() callback. The image source is only pushed onto the result array in the case where the filter operation would have kept it.
update — This question gets a lot of attention, and I'd like to add the following clarifying remark....
Targeting position:sticky elements that are currently in a 'stuck' state
...n be made with many already existing pseudo-classes (e.g. :hover changing width and :not(:hover) changing back again). I would love :stuck pseudo-class and think that the developer should be responsible for not having the circular issues in his code.
– Marek Lisý
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