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What is a callback function?
..., callback, params)
{
result = number! // i can make up operators in my pseudocode
callback (result, params)
}
Now that factorial allows this pattern, your callback might look like this:
logIt (number, logger)
{
logger.log(number)
}
and your call to factorial would be
factorial(...
How to show all privileges from a user in oracle?
...much if you're looking to do something programmatically. So I put together my own query:
SELECT
PRIVILEGE,
OBJ_OWNER,
OBJ_NAME,
USERNAME,
LISTAGG(GRANT_TARGET, ',') WITHIN GROUP (ORDER BY GRANT_TARGET) AS GRANT_SOURCES, -- Lists the sources of the permission
MAX(ADMIN_OR_GRA...
Multiple aggregations of the same column using pandas GroupBy.agg()
...
You can simply pass 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':
...
Memory management in Qt?
...anagement and the life of objects. When do I need to delete and/or destroy my objects? Is any of this handled automatically?
...
What are fixtures in programming?
...
I'm writing this answer as quick note for myself on what is "fixture".
same-data-multiple-tests
Test Fixtures: Using the Same Data Configuration for Multiple Tests
If you find yourself writing two or more tests that operate on similar data, you can use a test fixtur...
Android: Difference between Parcelable and Serializable?
...ace is easier to implement.
Look at the example below (Serializable):
// MyObjects Serializable class
import java.io.Serializable;
import java.util.ArrayList;
import java.util.TreeMap;
import android.os.Parcel;
import android.os.Parcelable;
public class MyObjects implements Serializable {
...
Python (and Python C API): __new__ versus __init__
...o an int as you did... I get an error about heap types or something... but my example of assigning it to a dynamically created class works.
– ArtOfWarfare
Jan 21 '16 at 18:52
...
Understanding implicit in Scala
I was making my way through the Scala playframework tutorial and I came across this snippet of code which had me puzzled:
...
Check synchronously if file/directory exists in Node.js
...e you could encounter some other error in checking for file existence.
So my code above is really doesFileExistAndDoIHaveAccessToIt(), but your question might be doesFileNotExistAndCouldICreateIt(), which would be completely different logic (that would need to account for an EPERM error, among othe...
Generate a random point within a circle (uniformly)
...radiusMathUtils.cos(MathUtils.PI2*random1/random2); float randomYPoint = random2*radiusMathUtils.sin(MathUtils.PI2*random1/random2);
– Tony Ceralva
Jun 9 '14 at 0:24
...