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How to study design patterns? [closed]
...me people already mentioned, practice and refactoring. I believe the right order to learn about patterns is this:
Learn Test Driven Development (TDD)
Learn refactoring
Learn patterns
Most people ignore 1, many believe they can do 2, and almost everybody goes straight for 3.
For me the key to im...
Obtaining a powerset of a set in Java
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Would this work even if size of the set is in the order of 10^5 ?
– bane19
Jul 9 '15 at 17:13
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Return 0 if field is null in MySQL
... Would that be IFNULL((SELECT SUM(uop.price * uop.qty) FROM uc_order_products uop WHERE uo.order_id = uop.order_id) AS products_subtotal, 0)?
– Kevin
Oct 22 '10 at 13:46
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Disable mouse scroll wheel zoom on embedded Google Maps
... This is a great solution. In my case, I had to specify a z-index in order for it to overlay correctly, though.
– RCNeil
Apr 17 '14 at 14:23
1
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Hidden features of Scala
...the match groups into a Seq[String], the elements of which are assigned in order to the variables year, month, and day.
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edited Aug 17 '11 at 12:19
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Cached, PHP generated Thumbnails load slowly
... cool tool cuzillion that could help you sort out things depending on your ordering of ressource loading.
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Count the items from a IEnumerable without iterating?
...as other responders say, being completely ignorant and always iterating in order to count elements.
In many cases where the programmer is just checking if( enumerable.Count != 0 ) using the Any() extension method, as in if( enumerable.Any() ) is far more efficient with linq's lazy evaluation as it...
Retrieving the last record in each group - MySQL
...TH ranked_messages AS (
SELECT m.*, ROW_NUMBER() OVER (PARTITION BY name ORDER BY id DESC) AS rn
FROM messages AS m
)
SELECT * FROM ranked_messages WHERE rn = 1;
Below is the original answer I wrote for this question in 2009:
I write the solution this way:
SELECT m1.*
FROM messages m1 LEFT...
jQuery callback on image load (even when the image is cached)
...code.
} ;
}) ;
Updated (to handle multiple images and with correctly ordered onload attachment):
$(document).ready(function() {
var imageLoaded = function() {
// Run onload code.
}
$('#img').each(function() {
var tmpImg = new Image() ;
tmpImg.onload = image...
Android Endless List
... to 0, for instance, the user has to scroll to the very end of the list in order to load more items.
(optional) As you can see, the "load-more check" is only called when the user stops scrolling. To improve usability, you may inflate and add a loading indicator to the end of the list via listView.ad...