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Most efficient way to create a zero filled JavaScript array?
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ES6 introduces Array.prototype.fill. It can be used like this:
new Array(len).fill(0);
Not sure if it's fast, but I like it because it's short and self-describing.
It's still not in IE (check compatibility), but there's a pol...
Design by contract using assertions or exceptions? [closed]
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The point in assertions is not to correct errors, but to alert the programmer. Keeping them enabled in release builds is useless for that reason: What would you have gained by having an assert firing? The developer won't be able to...
Creating an Android trial application that expires after a fixed time period
... game with great results. The whole app would load, but the user can only interact with the dialog that is seen, there is a button on that dialog that takes the user directly to the purchase page for the game. Users don't seem to mind AFAIK since that game has been in the top 10 paid apps since th...
What is the most accurate way to retrieve a user's correct IP address in PHP?
...ES_RANGE) === false)
{
return false;
}
self::$ip = sprintf('%u', ip2long($ip)); // you seem to want this
return true;
}
Also your HTTP_X_FORWARDED_FOR snippet can be simplified from this:
// check for IPs passing through proxies
if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])...
Setting variable to NULL after free
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Setting unused pointers to NULL is a defensive style, protecting against dangling pointer bugs. If a dangling pointer is accessed after it is freed, you may read or overwrite random memory. If a null pointer is accessed, you get an immediate ...
Does order of where clauses matter in SQL?
...le (or clustered index) scan instead of using an index (because the lookup into the full data page to get all other columns just gets too expensive very quickly).
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When should I use the Visitor Design Pattern? [closed]
... Animal { };
(Suppose it is a complex hierarchy with a well-established interface.)
Now we want to add a new operation to the hierarchy, namely we want each animal to make its sound. As far as the hierarchy is this simple, you can do it with straight polymorphism:
class Animal
{ public: virtual...
Any difference between First Class Function and High Order Function
...the language treats functions as values – that you can assign a function into a variable, pass it around etc. Higher-order functions are functions that work on other functions, meaning that they take one or more functions as an argument and can also return a function.
The “higher-order” conce...
scala vs java, performance and memory? [closed]
I am keen to look into Scala, and have one basic question I cant seem to find an answer to:
in general, is there a difference in performance and usage of memory between Scala and Java?
...
Easier way to debug a Windows service
...ommand line switch for that purpose?
Couldn't you just do:
public static int Main(string[] args)
{
if (!Environment.UserInteractive)
{
// Startup as service.
}
else
{
// Startup as application
}
}
That would have the "benefit", that you can just start your app via doubleclick...