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Understanding the ngRepeat 'track by' expression
...ies understanding how the track by expression of ng-repeat in angularjs works. The documentation is very scarce: http://docs.angularjs.org/api/ng/directive/ngRepeat
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When should I use the Visitor Design Pattern? [closed]
I keep seeing references to the visitor pattern in blogs but I've got to admit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it.
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Can I use __init__.py to define global variables?
...__init__.py:
MY_CONSTANT = 42
mypackage/mymodule.py:
from mypackage import MY_CONSTANT
print "my constant is", MY_CONSTANT
Then, import mymodule:
>>> from mypackage import mymodule
my constant is 42
Still, if you do have constants, it would be reasonable (best practices, probably) ...
jQuery: keyPress Backspace won't fire?
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Why would keyup fire for Backspace when keypress won't?
– Aaron Digulla
Jan 14 '11 at 11:11
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Providing a default value for an Optional in Swift?
The idiom for dealing with optionals in Swift seems excessively verbose, if all you want to do is provide a default value in the case where it's nil:
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How to explain callbacks in plain english? How are they different from calling one function from ano
...cation needs to execute different functions based upon its context/state. For this, we use a variable where we would store the information about the function to be called. According to its need the application will set this variable with the information about function to be called and will call t...
Start service in Android
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Probably you don't have the service in your manifest, or it does not have an <intent-filter> that matches your action. Examining LogCat (via adb logcat, DDMS, or the DDMS perspective in Eclipse) should turn up some warnings that may help.
More likely, you should start th...
Npm Please try using this command again as root/administrator
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It turns out that you don’t have to run the command again as Administrator, and doing so won’t fix the problem.
Try:
npm cache clean first.
If that doesn’t fix things, take a look in %APPDATA%\npm-cache, or if you’re using PowerShell, $env:APPDATA\npm-cache.
After cleaning the cac...
What's the difference between parenthesis $() and curly bracket ${} syntax in Makefile?
... any differences in invoking variables with syntax ${var} and $(var) ? For instance, in the way the variable will be expanded or anything?
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How to define custom configuration variables in rails
...ariables to a rails application and how to access them in the controller, for e.g I wanna be able to define an upload_directory in the configuration files say development.rb and be able to access it in one of my controllers.
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