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Reference: What is variable scope, which variables are accessible from where and what are “undefined
What is "variable scope" in PHP? Are variables from one .php file accessible in another? Why do I sometimes get "undefined variable" errors?
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Are there console commands to look at whats in the queue and to clear the queue in Sidekiq?
I'm used to using delayed_jobs method of going into the console to see whats in the queue, and the ease of clearing the queue when needed. Are there similar commands in Sidekiq for this? Thanks!
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Check if a given key already exists in a dictionary and increment it
...import defaultdict
my_dict = defaultdict(int)
my_dict[key] += 1
will do what you want.
For regular Python dicts, if there is no value for a given key, you will not get None when accessing the dict -- a KeyError will be raised. So if you want to use a regular dict, instead of your code you would ...
Constant Amortized Time
What is meant by "Constant Amortized Time" when talking about time complexity of an algorithm?
6 Answers
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.gitignore for PhoneGap/Cordova 3.0 projects - what should I commit?
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It doesn't matter what platforms you are developing. There is no harm in ignoring things that only apply to platforms that you are not developing on yet. He has implied he is using the standard directory structure.
– rjm...
Java EE 6 @javax.annotation.ManagedBean vs. @javax.inject.Named vs. @javax.faces.ManagedBean
...ptors, decorators, integration SPI, very flexible, etc. and it can even do what EJB and JSF managed beans are doing then we can have just one mature and powerful DI container. But for some backward compatibility and political reasons Java EE guys want to keep them!!!
Here you can find the differenc...
git add only modified changes and ignore untracked files
... in these comments will fail if you have odd filenames (spaces, asterisks, what not). To properly escape any strangely named files, use: IFS=$(echo -en "\n\b"); for file in $(git diff --name-only); do git add "$file"; done
– Orwellophile
Aug 24 '16 at 2:52
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Control the size of points in an R scatterplot?
...symbol sized between "." and 19.
It's a filled symbol (which is probably what you want).
Aside from that, even the base graphics system in R allows a user fine-grained control over symbol size, color, and shape. E.g.,
dfx = data.frame(ev1=1:10, ev2=sample(10:99, 10), ev3=10:1)
with(dfx, symbols...
How can I test a Windows DLL file to determine if it is 32 bit or 64 bit? [duplicate]
...if's to evaluate properly. Not sure if it was a platform-specific issue or what.
– valverij
Oct 7 '16 at 20:46
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How to colorize diff on the command line?
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First, what kind of shell is this? zsh? I don't recognize =(...) construct. Second, I had diff -ur a b in mind.
– x-yuri
May 5 '15 at 9:47
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