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Iterating over every two elements in a list
...lementation.
For Python 2:
from itertools import izip
def pairwise(iterable):
"s -> (s0, s1), (s2, s3), (s4, s5), ..."
a = iter(iterable)
return izip(a, a)
for x, y in pairwise(l):
print "%d + %d = %d" % (x, y, x + y)
Or, more generally:
from itertools import izip
def group...
Why should I use a pointer rather than the object itself?
I'm coming from a Java background and have started working with objects in C++. But one thing that occurred to me is that people often use pointers to objects rather than the objects themselves, for example this declaration:
...
What's wrong with overridable method calls in constructors?
... Wicket page class that sets the page title depending on the result of an abstract method.
7 Answers
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Script parameters in Bash
I'm trying to make a shell script which should be used like this:
5 Answers
5
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Rotating a two-dimensional array in Python
...for the optimal solution I found this impressive one-liner that does the job:
7 Answers
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Java SafeVarargs annotation, does a standard or best practice exist?
...
1) There are many examples on the Internet and on StackOverflow about the particular issue with generics and varargs. Basically, it's when you have a variable number of arguments of a type-parameter type:
<T> void foo(T... args);
In Java, varargs are a syntactic sugar that undergo...
The tilde operator in C
...
The ~ operator is bitwise NOT, it inverts the bits in a binary number:
NOT 011100
= 100011
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What is the difference between RegExp’s exec() function and String’s match() function?
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exec with a global regular expression is meant to be used in a loop, as it will still retrieve all matched subexpressions. So:
var re = /[^\/]+/g;
var match;
while (match = re.exec('/a/b/c/d')) {
// match is now the next match, in arr...
Using comma as list separator with AngularJS
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You could do it this way:
<b ng-repeat="email in friend.email">{{email}}{{$last ? '' : ', '}}</b>
..But I like Philipp's answer :-)
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How to print (using cout) a number in binary form?
I'm following a college course about operating systems and we're learning how to convert from binary to hexadecimal, decimal to hexadecimal, etc. and today we just learned how signed/unsigned numbers are stored in memory using the two's complement (~number + 1).
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