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Call by name vs call by value in Scala, clarification needed
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The em>x m>ample you have given only uses call-by-value, so I will give a new, simpler, em>x m>ample that shows the difference.
First, let's assume we have a function with a side-effect. This function prints something out and then returns...
string.charAt(m>x m>) or string[m>x m>]?
Is there any reason I should use string.charAt(m>x m>) instead of the bracket notation string[m>x m>] ?
6 Answers
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How to echo shell commands as they are em>x m>ecuted
In a shell script, how do I echo all shell commands called and em>x m>pand any variable names?
13 Answers
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Fastest way to convert string to integer in PHP
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I've just set up a quick benchmarking em>x m>ercise:
Function time to run 1 million iterations
--------------------------------------------
(int) "123": 0.55029
intval("123"): 1.0115 (183%)
(int) "0": 0.42461
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How is __eq__ handled in Python and in what order?
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The a == b em>x m>pression invokes A.__eq__, since it em>x m>ists. Its code includes self.value == other. Since int's don't know how to compare themselves to B's, Python tries invoking B.__eq__ to see if it knows how to compare itself to an int....
nonlocal keyword in Python 2.m>x m>
...local variable but it seems like this keyword is not available in python 2.m>x m>. How should one access nonlocal variables in closures in these versions of python?
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How to check if a number is a power of 2
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There's a simple trick for this problem:
bool IsPowerOfTwo(ulong m>x m>)
{
return (m>x m> & (m>x m> - 1)) == 0;
}
Note, this function will report true for 0, which is not a power of 2. If you want to em>x m>clude that, here's how:
bool IsPowerOfTwo(ulong m>x m>)
{
return (m>x m> != 0) && ((m>x m> &amp...
Why aren't python nested functions called closures?
... access to a local variable from an enclosing scope that has finished its em>x m>ecution.
def make_printer(msg):
def printer():
print msg
return printer
printer = make_printer('Foo!')
printer()
When make_printer is called, a new frame is put on the stack with the compiled code for the...
Remove empty strings from a list of strings
...ythonic way:
>>> strings = ["first", "", "second"]
>>> [m>x m> for m>x m> in strings if m>x m>]
['first', 'second']
If the list must be modified in-place, because there are other references which must see the updated data, then use a slice assignment:
strings[:] = [m>x m> for m>x m> in strings if m>x m>]
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Elegant way to combine multiple collections of elements?
...rary number of collections, each containing objects of the same type (for em>x m>ample, List<int> foo and List<int> bar ). If these collections were themselves in a collection (e.g., of type List<List<int>> , I could use SelectMany to combine them all into one collection.
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