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How to detect if multiple keys are pressed at once using JavaScript?

...can remember what they were. You should also put the key codes in the same order as the documentation (CTRL+ENTER => map[17] && map[13], NOT map[13] && map[17]). This way you won't ever get confused when you need to go back and edit the code. A gotcha with if-else chains If checki...
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In C++, is it still bad practice to return a vector from a function?

...hz 64bit processor. We could do better by parallelizing the computation in order to use all 8 cores (the test above only uses one core at a time, which I have verified by re-running the test while monitoring CPU usage). The best performance is achieved when mem(v) = 16kB, which is the order of magni...
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Making an array of integers in iOS

... If the order of your integers is not required, and if there are only unique values you can also use NSIndexSet or NSMutableIndexSet You will be able to easily add and remove integers, or check if your array contains an integer wi...
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Factory pattern in C#: How to ensure an object instance can only be created by a factory class?

... make sure any instance of this class will have a valid internal state. In order to achieve this I will need to perform some check before creating an object, probably in its constructor. This is all okay until I decide I want to make this check be a part of the business logic. So, how can I arrange ...
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'0000-00-00 00:00:00' can not be represented as java.sql.Timestamp error

...er languages. So, if I "just change the database", thousands of lines of PHP code will break. Java programmers need to accept the MySQL zero-date and they need to put a zero date back into the database, when other languages rely on this "feature". A programmer connecting to MySQL needs to handle...
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Can table columns with a Foreign Key be NULL?

...u mean by 'the above'? Note that if you're referring to another answer the order may change. – d219 Mar 8 '19 at 17:35 add a comment  |  ...
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jQuery, simple polling example

... function poll(){ $("ajax.php", function(data){ //do stuff }); } setInterval(function(){ poll(); }, 5000); share | improve this answ...
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iPhone: Detecting user inactivity/idle time since last screen touch

...xceeded"); } where maxIdleTime and idleTimer are instance variables. In order for this to work, you also need to modify your main.m to tell UIApplicationMain to use your delegate class (in this example, AppDelegate) as the principal class: int retVal = UIApplicationMain(argc, argv, @"AppDelegate...
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How to find what code is run by a button or element in Chrome using Developer Tools

...Query's abstraction and functionality, a lot of hoops have to be jumped in order to get to the meat of the event. I have set up this jsFiddle to demonstrate the work. 1. Setting up the Event Listener Breakpoint You were close on this one. Open the Chrome Dev Tools (F12), and go to the Sources ...
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Disable submit button when form invalid with AngularJS

... Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity. ...