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Why does “return list.sort()” return None, not the list?
...verify that the findUniqueWords does result in a sorted list . However, it does not return the list. Why?
7 Answers
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Best way to merge two maps and sum the values of same key?
...tor over any duplicate values. The standard semigroup for Int uses the addition operator, so you get the sum of values for each duplicate key.
Edit: A little more detail, as per user482745's request.
Mathematically a semigroup is just a set of values, together with an operator that takes two valu...
How to get index of object by its property in JavaScript?
...ggest, looping through the array is probably the best way. But I would put it in it's own function, and make it a little more abstract:
function findWithAttr(array, attr, value) {
for(var i = 0; i < array.length; i += 1) {
if(array[i][attr] === value) {
return i;
...
How to export DataTable to Excel
... to Excel in C#? I am using Windows Forms. The DataTable is associated with a DataGridView control. I have to export records of DataTable to Excel.
...
Create request with POST, which response codes 200 or 201 and content
Suppose I write a REST service whose intent is to add a new data item to a system.
7 Answers
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How will I know when to create an interface?
...
it solves this concrete problem:
you have a, b, c, d of 4 different types. all over your code you have something like:
a.Process();
b.Process();
c.Process();
d.Process();
why not have them implement IProcessable, and then...
pythonic way to do something N times without an index variable?
...
A slightly faster approach than looping on xrange(N) is:
import itertools
for _ in itertools.repeat(None, N):
do_something()
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Fastest way to convert string to integer in PHP
...a quick benchmarking exercise:
Function time to run 1 million iterations
--------------------------------------------
(int) "123": 0.55029
intval("123"): 1.0115 (183%)
(int) "0": 0.42461
intval("0"): 0.95683 (225%)
(int) int...
Do git tags get pushed as well?
Since I created my repository it appears that the tags I have been
creating are not pushed to the repository. When I do git tag on the
local directory all the tags are present, but when I logon to the
remote repository and do a git tag , only the first few show up.
...
static constructors in C++? I need to initialize private static objects
I want to have a class with a private static data member (a vector that contains all the characters a-z). In java or C#, I can just make a "static constructor" that will run before I make any instances of the class, and sets up the static data members of the class. It only gets run once (as the vari...