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What is meant by Scala's path-dependent types?
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My favorite example:
case class Board(length: Int, height: Int) {
case class Coordinate(x: Int, y: Int) {
require(0 <= x && x < length && 0 <= y && y < height)
}
val occupied =...
pandas three-way joining multiple dataframes on columns
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This didn't quite work for my dfs with column multi indexes (it was injecting the 'on' as a column which worked for the first merge, but subsequent merges failed), instead I got it to work with: df = reduce(lambda left, right: left.join(right, how='ou...
What's the difference between dynamic (C# 4) and var?
...lain difference between dynamic and var.
dynamic d1;
d1 = 1;
d1 = "http://mycodelogic.com";
This will work. compiler can re-create the type of dynamic variable.
first it create type as integer and after that compiler will recreate type as string but in case of var
var v1; // Compiler will thro...
How do I clear this setInterval inside a function?
...ear it like var the_int = setInterval(); clearInterval(the_int); but for my code to work I put it in an anonymous function:
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Disable IPython Exit Confirmation
... re 1. alias ipython="ipython --no-confirm-exit --no-banner" has become my preferred way to launch ipython
– jwalton
Sep 3 at 11:41
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Using generic std::function objects with member functions in one class
...unction without the class instance, you can do something like this:
class MyClass
{
public:
void MemberFunc(int value)
{
//do something
}
};
// Store member function binding
auto callable = std::mem_fn(&MyClass::MemberFunc);
// Call with late supplied 'this'
MyClass myInst;
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How to parse JSON in Java
...on(String name) {
this.name = name;
}
}
Google GSON (Maven)
My personal favourite as to the great JSON serialisation / de-serialisation of objects.
Gson g = new Gson();
Person person = g.fromJson("{\"name\": \"John\"}", Person.class);
System.out.println(person.name); //John
System....
Can you attach Amazon EBS to multiple instances?
We currently use multiple webservers accessing one mysql server and fileserver. Looking at moving to the cloud, can I use this same setup and attach the EBS to multiple machine instances or what's another solution?
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MongoDB inserts float when trying to insert integer
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My application has broken in different points only for one reason, int is saved and returned as float. I suspect the cause must be some manual insertions I did via mongo shell which uses javascript.
– Me...
Numpy where function multiple conditions
...ists - r - dr/2.) <= dr/2.]
It only creates one boolean array, and in my opinion is easier to read because it says, is dist within a dr or r? (Though I'd redefine r to be the center of your region of interest instead of the beginning, so r = r + dr/2.) But that doesn't answer your question.
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