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Where does the “flatmap that s***” idiomatic expression in Scala come from?
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The reasoning behind this phrase is that you can replace a lot of tedious if/then/else code you would write with calls to flatMap (and other higher order functions).
This is especially true for Options (see http://tonymorris.github.io/blog/posts/scalaoption-cheat-sheet/)
But it applies to o...
Reading file contents on the client-side in javascript in various browsers
I'm attempting to provide a script-only solution for reading the contents of a file on a client machine through a browser.
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How is the default submit button on an HTML form determined?
...s considered active; this doesn't really fall under the remit of your question since here the submit button is unambiguous but I thought I'd include it for people who read the first part and wonder how to make a submit button successful via JS form submission. Of course, the form's onsubmit handler...
What are Runtime.getRuntime().totalMemory() and freeMemory()?
...t of memory required to hold an object of any given type may be implementation-dependent.
maxMemory()
Returns the maximum amount of memory that the Java virtual machine will attempt to use. If there is no inherent limit then the value Long.MAX_VALUE will be returned.
freeMemory()
Returns the a...
Difference between 'python setup.py install' and 'pip install'
...r you, with a minimum amount of fuss.
However, using pip offers some additional advantages that make it much nicer to use.
pip will automatically download all dependencies for a package for you. In contrast, if you use setup.py, you often have to manually search out and download dependencies, whi...
Comparing object properties in c# [closed]
...gnoreList = new List<string>(ignore);
foreach (System.Reflection.PropertyInfo pi in type.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance))
{
if (!ignoreList.Contains(pi.Name))
{
object selfValue =...
How to find out the number of CPUs using python
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If you have python with a version >= 2.6 you can simply use
import multiprocessing
multiprocessing.cpu_count()
http://docs.python.org/library/multiprocessing.html#multiprocessing.cpu_count
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What is “lifting” in Haskell?
...an short-circuit this by writing the unwrap-and-wrap code once. This function is traditionally called a "lift" because it looks like this:
liftFoo2 :: (a -> b -> c) -> Foo a -> Foo b -> Foo c
In other words you have a function which takes a two-argument function (such as the (+) o...
Threads vs Processes in Linux
...y problems (such as locking) associated with threads. However, I am suspicious, because it seems like threads could give a pretty big performance gain in some situations.
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How do I choose between Semaphore and SemaphoreSlim?
Their public interfaces appear similar. The documentation states that the SemaphoreSlim is a lightweight alternative and doesn't use Windows Kernel semaphores. This resource states that the SemaphoreSlim is much faster. In what situations does the SemaphoreSlim make more sense over the Semaph...