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Deleting array elements in JavaScript - delete vs splice
What is the difference between using the delete operator on the array element as opposed to using the Array.splice method ?
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What does “abstract over” mean?
Often in the Scala literature, I encounter the phrase "abstract over", but I don't understand the intent. For example , Martin Odersky writes
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python pandas: Remove duplicates by columns A, keeping the row with the highest value in column B
... want to drop duplicates, keeping the row with the highest value in column B.
12 Answers
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Delete an element from a dictionary
...s the existing dictionary so the contents of the dictionary changes for anybody else who has a reference to the same instance. To return a new dictionary, make a copy of the dictionary:
def removekey(d, key):
r = dict(d)
del r[key]
return r
The dict() constructor makes a shallow copy....
What is a word boundary in regex?
...ic output, among other purposes) and cannot find a precise definition of \b ("word boundary"). I had assumed that -12 would be an "integer word" (matched by \b\-?\d+\b ) but it appears that this does not work. I'd be grateful to know of ways of matching space-separated numbers.
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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
I have a data frame df and I use several columns from it to groupby :
7 Answers
7
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How to define an enumerated type (enum) in C?
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Declaring an enum variable is done like this:
enum strategy {RANDOM, IMMEDIATE, SEARCH};
enum strategy my_strategy = IMMEDIATE;
However, you can use a typedef to shorten the variable declarations, like so:
typedef enum {RANDOM, IMMEDIATE, SEARC...
Append a NumPy array to a NumPy array
I have a numpy_array. Something like [ a b c ] .
9 Answers
9
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Java Generics (Wildcards)
I have a couple of questions about generic wildcards in Java:
6 Answers
6
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Convert list of dictionaries to a pandas DataFrame
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cs95
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answered Dec 17 '13 at 15:35
jorisjoris
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