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Functional programming - is immutability expensive? [closed]
...The “in-place” quicksort isn’t really in-place (and quicksort is not by definition in-place). It requires additional storage in the form of stack space for the recursive step, which is in the order of O(log n) in the best case, but O(n) in the worst case.
Implementing a functional variant of q...
Sorting arraylist in alphabetical order (case insensitive)
...ames which contains names of people. I want to sort the arraylist in alphabetical order.
8 Answers
...
Rename a dictionary key
...dict[new_key] = mydict.pop(old_key)
For an OrderedDict, I think you must build an entirely new one using a comprehension.
>>> OrderedDict(zip('123', 'abc'))
OrderedDict([('1', 'a'), ('2', 'b'), ('3', 'c')])
>>> oldkey, newkey = '2', 'potato'
>>> OrderedDict((newkey if...
Simplest/Cleanest way to implement singleton in JavaScript?
...
I think the easiest way is to declare a simple object literal:
var myInstance = {
method1: function () {
// ...
},
method2: function () {
// ...
}
};
If you want private members on your singleton instance, you can do something like this:
var myInstance ...
What is this operator in MySQL?
I'm working on code written by a previous developer and in a query it says,
9 Answers
...
What's the syntax for mod in java
... % 2) == 0)
{
isEven = true;
}
else
{
isEven = false;
}
This can be simplified to a one-liner:
isEven = (a % 2) == 0;
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How do I count unique values inside a list
... the user for input and store the values in an array / list.
Then when a blank line is entered it will tell the user how many of those values are unique.
I'm building this for real life reasons and not as a problem set.
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“Comparison method violates its general contract!”
...
Your comparator is not transitive.
Let A be the parent of B, and B be the parent of C. Since A > B and B > C, then it must be the case that A > C. However, if your comparator is invoked on A and C, it would return zero, meaning A == C. This violates the con...
How does lucene index documents?
I read some document about Lucene; also I read the document in this link
( http://lucene.sourceforge.net/talks/pisa ).
4 An...
Python function as a function argument?
Can a Python function be an argument of another function?
10 Answers
10
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