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What are free monads?
...gives you a way to "get out" of it.
More generally, if X is a Y with some extra stuff P, then a "free X" is a a way of getting from a Y to an X without gaining anything extra.
Examples: a monoid (X) is a set (Y) with extra structure (P) that basically says it has an operation (you can think of add...
What is the advantage to using bloom filters?
... bits, for small integers, to an
arbitrary number of bits, such as for
strings (tries are an exception, since
they can share storage between
elements with equal prefixes). Linked
structures incur an additional linear
space overhead for pointers. A Bloom
filter with 1% error and an opti...
Boolean vs boolean in Java
... Booleans, conditional operators and autoboxing):
public static void main(String[] args) throws Exception {
Boolean b = true ? returnsNull() : false; // NPE on this line.
System.out.println(b);
}
public static Boolean returnsNull() {
return null;
}
Use Boolean when you need an object, e...
What's the right OAuth 2.0 flow for a mobile app
...the url parameter.
public void onPageStarted(final WebView webView, final String url,
final Bitmap favicon) {}
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Groovy executing shell commands
Groovy adds the execute method to String to make executing shells fairly easy;
7 Answers
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Create a string of variable length, filled with a repeated character
...as been asked by someone else in it's Java form here: Java - Create a new String instance with specified length and filled with specific character. Best solution?
...
When should I use Struct vs. OpenStruct?
....new(:data1, :data2)
n = Newtype.new
C:
typedef struct {
int data1;
char data2;
} newtype;
newtype n;
The OpenStruct class can be compared to an anonymous struct declaration in C. It allows the programmer to create an instance of a complex type.
Ruby:
o = OpenStruct.new(data1: 0, data2:...
Throw keyword in function's signature
...lowing code?
#include <iostream>
void throw_exception() throw(const char *)
{
throw 10;
}
void my_unexpected(){
std::cout << "well - this was unexpected" << std::endl;
}
int main(int argc, char **argv){
std::set_unexpected(my_unexpected);
try{
throw_excepti...
Why would $_FILES be empty when uploading files to PHP?
...d be 100M not 100MB.
Make sure your <form> tag has the enctype="multipart/form-data" attribute. No other tag will work, it has to be your FORM tag. Double check that it is spelled correctly. Double check that multipart/form-data is surrounded by STRAIGHT QUOTES, not smart quotes pasted in fro...
Programmatically get the version number of a DLL
...g scheme with something like "1.2012.0508.0101", when one gets the version string you'll actually get "1.2012.518.101"; note the missing zeros.
So, here's a few extra functions to get the version of a DLL (embedded or from the DLL file):
public static System.Reflection.Assembly GetAssembly(str...