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What is the proper way to check for null values?
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What about
string y = (Session["key"] ?? "none").ToString();
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Recommended way of making React component/div draggable
I want to make a draggable (that is, repositionable by mouse) React component, which seems to necessarily involve global state and scattered event handlers. I can do it the dirty way, with a global variable in my JS file, and could probably even wrap it in a nice closure interface, but I want to kno...
Preloading images with jQuery
...;
});
}
// Usage:
preload([
'img/imageName.jpg',
'img/anotherOne.jpg',
'img/blahblahblah.jpg'
]);
Or, if you want a jQuery plugin:
$.fn.preload = function() {
this.each(function(){
$('<img/>')[0].src = this;
});
}
// Usage:
$(['img1.jpg','img2.jpg','img3....
Sorting an array of objects by property values
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One issue I have with this is that with reverse=false, it will sort numbers as 1,2,3,4... but Strings as z,y,x...
– Abby
Apr 26 '12 at 13:42
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How can I combine two HashMap objects containing the same types?
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If you get a NPE, then apparently you did not initialize one of your objects properly. Do you print the stacktrace in the catch block? So you know where the problem arises. But unless you post the full and exact code including the stack trace you will need to track that down on you...
Does MySQL index foreign key columns automatically?
...million records. This is ofc MySQL 5.1 InnoDB. The table has three fields, one is primary key integer, the other is already indexed. The third was a foreign key to primary key of another table. Without adding an explicit index, lookups took several seconds here. Show index from table also didn't sho...
Why does Ruby have both private and protected methods?
...e ignored by default by RDoc when generating documentation while protected ones are not. You can always use the --all flag to include them.
– jasoares
Mar 7 '14 at 1:01
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Is the pImpl idiom really used in practice?
...ue.
Data hiding
If you're developing a library, especially a proprietary one, it might be desirable not to disclose what other libraries / implementation techniques were used to implement the public interface of your library. Either because of Intellectual Property issues, or because you believe t...
When would you use the different git merge strategies?
...e is the default for non-fast-forward merges. We're all familiar with that one.
Octopus
I've used octopus when I've had several trees that needed to be merged. You see this in larger projects where many branches have had independent development and it's all ready to come together into a single he...
List passed by ref - help me explain this behaviour
...ed myList.Sort();
Finally, when you did: myList' = myList2, you lost the one of the reference but not the original and the collection stayed sorted.
If you use by reference (ref) then myList' and myList will become the same (only one reference).
Note: I use myList' to represent the parameter t...