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What is a 'Closure'?
...unction as a value. The moment we call this function can be remote in time from the moment the function has been defined (or created). In particular, its wrapping function is no longer running, and its parameters which has been on the call stack are no longer there :P This makes a problem, because t...
font-style: italic vs oblique in CSS
...lated version of an italic font, created by slanting the normal version.
From here, we deduce that if an italic version of the font is not available, both italic and oblique behave the same way. Since the W3Schools code snippet does not specify any particular font-family, I believe a default font...
How to get the difference between two arrays of objects in JavaScript
...eturn a.value ===... in your answer? (Nice solution, by the way, +1) Aside from using Array.prototype.some(), I can't really find a more efficient / shorter way of doing this.
– Cerbrus
Feb 24 '14 at 14:08
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Auto reloading python Flask app upon code changes
...eload the flask app when a code change happens.
app.run(debug=True)
Or, from the shell:
$ export FLASK_DEBUG=1
$ flask run
http://flask.pocoo.org/docs/quickstart/#debug-mode
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How to keep a Python script output window open?
...
You have a few options:
Run the program from an already-open terminal. Open a command prompt and type:
python myscript.py
For that to work you need the python executable in your path. Just check on how to edit environment variables on Windows, and add C:\PYTHON2...
Convert datetime to Unix timestamp and convert it back in python
...f your original naive datetime was UTC, the way to recover it is to use utcfromtimestamp instead of fromtimestamp.
On the other hand, if your original naive datetime was local, you shouldn't have subtracted a UTC timestamp from it in the first place; use datetime.fromtimestamp(0) instead.
Or, if y...
Do try/catch blocks hurt performance when exceptions are not thrown?
...tight loops mate. Example the loop where you read and de-serialize objects from a socket data stream in game server and your trying to squeeze as much as you can. So you MessagePack for object serialization instead of binaryformatter, and use ArrayPool<byte> instead of just creating byte array...
Should I use alias or alias_method?
...re predictable. Also, can you provide any practical example of benefitting from redefining alias_method?
– Boris Stitnicky
Nov 3 '12 at 19:17
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Easy way to prevent Heroku idling?
...eature that will ping your site twice per minute, thus preventing the dyno from idling.
More or less the same solution as Jesse but maybe more integrated to Heroku... And with a few perks (performance monitoring is just great).
Note: to all those saying it doesn't work: the important part in ...
How to center a subview of UIView
...nd it will always work:
child.center = [parent convertPoint:parent.center fromView:parent.superview];
And for Swift:
child.center = parent.convert(parent.center, from:parent.superview)
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