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How do lexical closures work?
...example.
In order to evaluate i and use its value, a common pattern is to set it as a parameter default: parameter defaults are evaluated when the def statement is executed, and thus the value of the loop variable is frozen.
The following works as expected:
flist = []
for i in xrange(3):
def...
public static const in TypeScript
...SHELF_NONE;
console.log(x);
If you run it, you'll see how the attempt to set the BOOK_SHELF_NONE property to a new value doesn't work.
2.0
In TypeScript 2.0, you can use readonly to achieve very similar results:
export class Library {
public static readonly BOOK_SHELF_NONE = "None";
pu...
How to disable an Android button?
...
Did you try this?
myButton.setEnabled(false);
Update: Thanks to Gwen. Almost forgot that android:clickable can be set in your XML layout to determine whether a button can be clickable or not.
...
Computational complexity of Fibonacci Sequence
I understand Big-O notation, but I don't know how to calculate it for many functions. In particular, I've been trying to figure out the computational complexity of the naive version of the Fibonacci sequence:
...
How to pass prepareForSegue: an object
... // Pass any objects to the view controller here, like...
[vc setMyObjectHere:object];
}
}
REVISION: You can also use performSegueWithIdentifier:sender: method to activate the transition to a new view based on a selection or button press.
For instance, consider I had two view ...
How to unstage large number of files without deleting the content
...
git reset
If all you want is to undo an overzealous "git add" run:
git reset
Your changes will be unstaged and ready for you to re-add as you please.
DO NOT RUN git reset --hard.
It will not only unstage your added files,...
Differences between .NET 4.0 and .NET 4.5 in High level in .NET
...LR) 4.0.
After the release of the .NET Framework 4, Microsoft released a set of enhancements, named Windows Server AppFabric, for application server capabilities in the form of AppFabric Hosting and in-memory distributed caching support.
.NET Framework 4.5
.NET Framework 4.5 was released on ...
Chrome, Javascript, window.open in new tab
...in an event listener or delegate not bound to the click event, or by using setTimeout for example), it loses it’s status as “user initiated”
6. Some popup blockers will allow windows opened from user initiated events, but not those opened otherwise.
7. If any popup is blocked, those normally...
How do I combine a background-image and CSS3 gradient on the same element?
...o gradients.
See notes for stacking images only IE < 9 below.
Line 1 sets a flat background color.
Line 2 sets the background image fallback.
The final line sets a background image and gradient for browsers that can handle them.
Line 3 is for all relatively modern browsers.
Nearly all cu...
Delete branches in Bitbucket
...one looked like this and I could not delete it:
Turned out someone had set Branch permissions under Settings and from there unchecked Allow deleting this branch. Hope this can help someone.
Update: Where settings are located from question in comment. Enter the repository that you wan't to edi...