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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...
Case insensitive 'in'
...follow
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edited Feb 11 at 14:36
answered Sep 2 '10 at 13:59
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Speed up the loop operation in R
I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the...
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...
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...
How do I put variables inside javascript strings?
That's how you do it in python. How can you do that in javascript/node.js?
13 Answers
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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...
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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Dynamic Anonymous type in Razor causes RuntimeBinderException
...nary<string, object> expando = new ExpandoObject();
foreach (var item in anonymousDictionary)
expando.Add(item);
return (ExpandoObject)expando;
}
It's very easy to use:
return View("ViewName", someLinq.Select(new { x=1, y=2}.ToExpando());
Of course in your view:
@foreach ...
Bootstrap 3 Navbar Collapse
...increase the point at which the bootstrap 3 navbar collapses (i.e. so that it collapses into a drop down on portrait tablets)?
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