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Why can I add named properties to an array as if it were an object?
... javascript is an object, so you can "abuse" an Array object by setting arbitrary properties on it. This should be considered harmful though. Arrays are for numerically indexed data - for non-numeric keys, use an Object.
Here's a more concrete example why non-numeric keys don't "fit" an Array:
var...
Spinlock versus Semaphore
...ossible implementation of a lock, namely one that is implemented by busy waiting ("spinning"). A semaphore is a generalization of a lock (or, the other way around, a lock is a special case of a semaphore). Usually, but not necessarily, spinlocks are only valid within one process whereas semaphores c...
nullable object must have a value
...e receiving was thrown in the .Value property of the Nullable DateTime, as it is required to return a DateTime (since that's what the contract for .Value states), but it can't do so because there's no DateTime to return, so it throws an exception.
In general, it is a bad idea to blindly call .Value...
Renaming a branch in GitHub
...
As mentioned, delete the old one on GitHub and re-push, though the commands used are a bit more verbose than necessary:
git push origin :name_of_the_old_branch_on_github
git push origin new_name_of_the_branch_that_is_local
Dissecting the commands a bit, the git...
Stashing only staged changes in git - is it possible?
... a way I can stash just my staged changes? The scenario I'm having issues with is when I've worked on several bugs at a given time, and have several unstaged changes. I'd like to be able to stage these files individually, create my .patch files, and stash them away until the code is approved. This w...
Differences between MySQL and SQL Server [closed]
...t the top-n section. In MySQL:
SELECT age
FROM person
ORDER BY age ASC
LIMIT 1 OFFSET 2
In SQL Server (T-SQL):
SELECT TOP 3 WITH TIES *
FROM person
ORDER BY age ASC
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What is the difference between window, screen, and document in Javascript?
...so can be treated as the root of the document object model. You can access it as window
window.screen or just screen is a small information object about physical screen dimensions.
window.document or just document is the main object of the potentially visible (or better yet: rendered) document ob...
Hidden features of Python [closed]
...; x <= 9
True
>>> 5 == x > 4
True
In case you're thinking it's doing 1 < x, which comes out as True, and then comparing True < 10, which is also True, then no, that's really not what happens (see the last example.) It's really translating into 1 < x and x < 10, and x <...
no gravity for scrollview. how to make content inside scrollview as center
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I had the same issue and finally figured it out. This is for a vertical ScrollView.
Put your ScrollView inside a RelativeLayout and center it in the RelativeLayout. In order for this to work, your ScrollView should have
android:layout_height="wrap_content"
Thi...
Syntax behind sorted(key=lambda: …)
I don't quite understand the syntax behind the sorted() argument:
9 Answers
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