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Why are preprocessor macros evil and what are the alternatives?
I have always asked this but I have never received a really good answer; I think that almost any programmer before even writing the first "Hello World" had encountered a phrase like "macro should never be used", "macro are evil" and so on, my question is: why? With the new C++11 is there a real alte...
Convert int to char in java
Below is a code snippet,
15 Answers
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How to modify list entries during for loop?
...rings, and I want to strip the strings themselves. Does replacement of mutable values count as modification?
9 Answers
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dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...g summarise with plyr 's ddply function, empty categories are dropped by default. You can change this behavior by adding .drop = FALSE . However, this doesn't work when using summarise with dplyr . Is there another way to keep empty categories in the result?
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Pandas groupby: How to get a union of strings
... df = read_csv(StringIO(data),sep='\s+')
In [5]: df
Out[5]:
A B C
0 1 0.749065 This
1 2 0.301084 is
2 3 0.463468 a
3 4 0.643961 random
4 1 0.866521 string
5 2 0.120737 !
In [6]: df.dtypes
Out[6]:
A int64
B float64
C object
dtype: obj...
Should I return a Collection or a Stream?
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The answer is, as always, "it depends". It depends on how big the returned collection will be. It depends on whether the result changes over time, and how important consistency of the returned result is. And it depends very much on how the user is likely to use the answer.
First, no...
Easy way to concatenate two byte arrays
What is the easy way to concatenate two byte arrays?
12 Answers
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What's the difference between array_merge and array + array?
A fairly simple question. What's the difference between:
9 Answers
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How does the “this” keyword work?
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I recommend reading Mike West's article Scope in JavaScript (mirror) first. It is an excellent, friendly introduction to the concepts of this and scope chains in JavaScript.
Once you start getting used to this, the rules are actually pretty si...
Combine the first two commits of a Git repository?
Suppose you have a history containing the three commits A, B and C :
8 Answers
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