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How the single threaded non blocking IO model works in Node.js
...de.js is built upon libuv, a cross-platform library that abstracts apis/syscalls for asynchronous (non-blocking) input/output provided by the supported OSes (Unix, OS X and Windows at least).
Asynchronous IO
In this programming model open/read/write operation on devices and resources (sockets, fil...
add column to mysql table if it does not exist
...D my_additional_column varchar(2048) NOT NULL DEFAULT '';
END IF;
END $$
CALL upgrade_database_1_0_to_2_0() $$
DELIMITER ;
On a first glance it probably looks more complicated than it should, but we have to deal with following problems here:
IF statements only work in stored procedures, not w...
Fixed size queue which automatically dequeues old values upon new enques
...with the queue values, all other functions but your new Enqueue will still call the original queue. In other words, although this answer is marked as accepted, it's completely and utterly broken.
– Gábor
Apr 22 '18 at 15:42
...
How to generate a random string of a fixed length in Go?
...er
Previous solutions get a random number to designate a random letter by calling rand.Intn() which delegates to Rand.Intn() which delegates to Rand.Int31n().
This is much slower compared to rand.Int63() which produces a random number with 63 random bits.
So we could simply call rand.Int63() and ...
Is there a Java equivalent or methodology for the typedef keyword in C++?
...in my experience, it's useful for adding semantics like: typedef int PlayerID which enables the compiler to make sure PlayerIDs aren't being used interchangeably with other ints, and it also makes code much more readable for humans. Basically, it's like an enum but without a limited set of values.
...
Action bar navigation modes are deprecated in Android L
Taking a look at the API diff report for the Android "L" preview, I see that all methods related to navigation modes in the ActionBar class (such as setNavigationMode() , addTab() , selectTab() , &c). are now deprecated.
...
iOS application: how to clear notifications?
...
It might also make sense to add a call to clearNotifications in applicationDidBecomeActive so that in case the application is in the background and comes back it will also clear the notifications.
- (void)applicationDidBecomeActive:(UIApplication *)applicat...
Java recursive Fibonacci sequence
...onacci(n - 1) + fibonacci(n - 2)
is very wrong.
The problem is that the it calls fibonacci not 50 times but much more.
At first it calls fibonacci(49)+fibonacci(48),
next fibonacci(48)+fibonacci(47) and fibonacci(47)+fibonacci(46)
Each time it became fibonacci(n) worse, so the complexity is exponent...
All Ruby tests raising: undefined method `authenticate' for nil:NilClass
...my tests are raising the following and I don't understand why. All methods call raise the 'authenticate' error. I've checked the code if there was a method called "authenticate" but there is no such method.
...
How do you check if a variable is an array in JavaScript? [duplicate]
... now goes 2/3 the speed!
So yet another update
Object.prototype.toString.call(variable) === '[object Array]';
This guy is the slowest for trying to check for an Array. However, this is a one stop shop for any type you're looking for. However, since you're looking for an array, just use the faste...