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What is the colon operator in Ruby?
...agically made into constants. Alternatively, you can consider the colon to mean "the thing named", so :id is "the thing named id".
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How to get package name from anywhere?
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If with the word "anywhere" you mean without having an explicit Context (for example from a background thread) you should define a class in your project like:
public class MyApp extends Application {
private static MyApp instance;
public static M...
Maven is not working in Java 8 when Javadoc tags are incomplete
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DocLint is a new feature in Java 8, which is summarized as:
Provide a means to detect errors in Javadoc comments early in the
development cycle and in a way that is easily linked back to the
source code.
This is enabled by default, and will run a whole lot of checks before generating Java...
What does it mean for a data structure to be “intrusive”?
... used to describe data structures like lists and stacks, but what does it mean?
2 Answers
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Empty set literal?
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You mean there is no literal syntax for the empty set? Or for sets in general?
– Johan Råde
May 25 '11 at 20:23
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Multiple aggregations of the same column using pandas GroupBy.agg()
...the functions as a list:
In [20]: df.groupby("dummy").agg({"returns": [np.mean, np.sum]})
Out[20]:
mean sum
dummy
1 0.036901 0.369012
or as a dictionary:
In [21]: df.groupby('dummy').agg({'returns':
{'Mean': np...
How to generate the “create table” sql statement for an existing table in postgreSQL
... has no password set, so I don't have to put in a password. The -t option means specify for one table. --schema-only means print only data about the table, and not the data in the table. Here is the exact command I use:
pg_dump -U pgadmin kurz_prod -t fact_stock_info --schema-only
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JSON Array iteration in Android/Java
...ayList.iterator();
}
This will make all instances of JSONArray iterable, meaning that the for (Object foo : bar) syntax will now work with it (note that foo has to be an Object, because JSONArrays do not have a declared type). All this works because the JSONArray class is backed by a simple ArrayL...
OAuth secrets in mobile apps
...example, deploy a new and unique SSL cert to each client. Is that what you mean? If it is more complex than this, maybe you can refer to a more in-depth writeup?
– Cheeso
Sep 16 '14 at 19:03
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Android Fragment lifecycle over orientation changes
...know the instance will be saved after the fragment is created and added? I mean hat if a user rotates just before Fragment is being added? We will still have non-null savedInstanceState that doesn't contain fragment state
– Farid
Aug 16 '19 at 12:23
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