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When and why are database joins expensive?
...aterialized. Also, in large queries with many joins you typically want to start with the smaller table sets and work your way up to the large ones, so that the set kept in memory remains as small as possible as long as possible.
When done properly, joins are generally the best way to compare, co...
Why does Windows64 use a different calling convention from all other OSes on x86-64?
...ond did a better job of explaining it than I did (unsurprisingly because I started from knowing very little about Windows), and the table of red-zone sizes for non-x86 is really neat.
– Peter Cordes
Feb 4 '19 at 1:28
...
Creating range in JavaScript - strange syntax
...dvanced topics in javascript, so this will be more-than-rather long. We'll start from the top. Buckle up!
1. Why not just Array(5).map?
What's an array, really? A regular object, containing integer keys, which map to values. It has other special features, for instance the magical length variable, ...
How to “perfectly” override a dict?
...till a problem, but once dust settles, renaming of attributes/variables to start with ci (and a big fat doc comment explaining that ci stands for case insensitive) I think is a perfect solution - as readers of the code must be fully aware that we are dealing with case insensitive underlying data str...
How can I sort arrays and data in PHP?
...t. It generalizes an exchanging sort, such as insertion or bubble sort, by starting the comparison and exchange of elements with elements that are far apart before finishing with neighboring elements.
function shellSort(array $array) {
$gaps = array(
1,
2,
...
What are the benefits of Java's types erasure?
...f existential quantification. But universal quantification is pretty good start. It's nice to be able to say that functions for List<A> work universally for all possible lists because A is completely unconstrained. This leads to what the Twitter user is talking about with respect to "parame...
to drawRect or not to drawRect (when should one use drawRect/Core Graphics vs subviews/images and wh
... it really worth it? The answer I have found is usually no. When I first started my game, I was working with the iPhone 3G. As my game grew in complexity, I began to see some lag, but with the newer devices it was completely unnoticeable. Now I have plenty of action going on, and the only lag se...
Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
...
@next Next sibling.
@root UIViewRoot instance of the view, can be used to start searching from the root instead the current component.
But, it also comes with some PrimeFaces specific keywords:
@row(n) nth row.
@widgetVar(name) Component with given widgetVar.
And you can even use something ca...
What is the best Distributed Brute Force countermeasure?
... @Abtin: Good idea, except that would be 'entering the arms race' -- ie. starting a 'who can outsmart whom' with the people who create password lists for dictionary attacks. I think a better way would be to enforce a strong password policy so there are no weak passwords
– Jen...
Is MATLAB OOP slow or am I doing something wrong?
I'm experimenting with MATLAB OOP , as a start I mimicked my C++'s Logger classes and I'm putting all my string helper functions in a String class, thinking it would be great to be able to do things like a + b , a == b , a.find( b ) instead
of strcat( a b ) , strcmp( a, b ) , retrieve first...