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What optimizations can GHC be expected to perform reliably?
... had this:
\x -> let y = expensive in x+y
In the above lambda, every time the function is called, y is recomputed. A better function, which floating out produces, is
let y = expensive in \x -> x+y
To facilitate the process, other transformations may be applied. For example, this happens:...
How do I initialize a byte array in Java?
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Smallest internal type, which at compile time can be assigned by hex numbers is char, as
private static final char[] CDRIVES_char = new char[] {0xe0, 0xf4, ...};
In order to have an equivalent byte array one might deploy conversions as
public static byte[] char...
Good MapReduce examples [closed]
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The most common example of mapreduce is for counting the number of
times words occur in a corpus. Suppose you had a copy of the internet
(I've been fortunate enough to have worked in such a situation), and
you wanted a list of every word on the internet as well as how many
times it occ...
How to get only time from date-time C# [closed]
...the value 6/22/2009 10:00:00 AM. How do I get only 10:00 Am from this date time.
14 Answers
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How do you 'redo' changes after 'undo' with Emacs?
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To undo: C-_
To redo after a undo: C-g C-_
Type multiple times on C-_ to redo what have been undone by C-_
To redo an emacs command multiple times, execute your command then type C-xz and then type many times on z key to repeat the command (interesting when you want to execute ...
HashMap to return default value for non-found keys?
... getOrDefault is very nice, but requires the default definition every time the map is accessed. Defining a default value once would also have readability benefits when creating a static map of values.
– ach
Aug 4 '14 at 14:19
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Is there a vim command to relocate a tab?
...b using mouse, I can no longer resize the pane using mouse. Instead, every time I click and drag mouse cursor, the tabs rearrange again, as if the mouse click "stuck". Do you have any idea what might be going on here?
– gmile
May 2 '17 at 9:26
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How can I get query string values in JavaScript?
...rByName('qux'); // null (absent)
Note: If a parameter is present several times (`?foo=lorem&foo=ipsum`), you will get the first value (`lorem`). There is no standard about this and usages vary, see for example this question: [Authoritative position of duplicate HTTP GET query keys](https://sta...
Simplest way to detect a mobile device in PHP
...o do, other than answer the question? tell them to use something else each time? i'm new here so im not sure if im supposed to link to the first answer?
– Justin DoCanto
Jun 13 '12 at 3:42
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What are the differences between the threading and multiprocessing modules?
...vents two threads in the same process from running Python code at the same time. This means that if you have 8 cores, and change your code to use 8 threads, it won't be able to use 800% CPU and run 8x faster; it'll use the same 100% CPU and run at the same speed. (In reality, it'll run a little slow...