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What is the most efficient way to concatenate N arrays?

...catenating more than two arrays, concat() is the way to go for convenience and likely performance. var a = [1, 2], b = ["x", "y"], c = [true, false]; var d = a.concat(b, c); console.log(d); // [1, 2, "x", "y", true, false]; For concatenating just two arrays, the fact that push accepts multiple ar...
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What is the shortest way to pretty print a org.w3c.dom.Document to stdout?

...ew OutputStreamWriter(out, "UTF-8"))); } (The indent-amount is optional, and might not work with your particular configuration) share | improve this answer | follow ...
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How to template If-Else structures in data-bound views?

... There are a couple different ways that you can handle this type of code. with an if/ifnot combination like you are now. This works fine and is not terribly verbose. Michael Best's switch/case binding (https://github.com/mbest/knockout-switch-case) is quite flexible and ...
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Reverse / invert a dictionary mapping

...g aspect of this new implementation is considered an implementation detail and should not be relied upon. There is no guarantee it will stay that way so don't write code relying on Dict having the same behavior as OrderedDict. – Mattias Aug 26 '18 at 17:44 ...
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Https Connection Android

I am doing a https post and I'm getting an exception of ssl exception Not trusted server certificate. If i do normal http it is working perfectly fine. Do I have to accept the server certificate somehow? ...
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this.setState isn't merging states as I would expect

...he value of the current state this.state.selected to construct a new state and then call setState() on that: var newSelected = _.extend({}, this.state.selected); newSelected.name = 'Barfoo'; this.setState({ selected: newSelected }); I've used function _.extend() function (from underscore.js libra...
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Is there a way to get a collection of all the Models in your Rails app?

... EDIT: Look at the comments and other answers. There are smarter answers than this one! Or try to improve this one as community wiki. Models do not register themselves to a master object, so no, Rails does not have the list of models. But you could st...
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jQuery show for 5 seconds then hide

...ation, it's just an instant effect. Or, another option is to use .delay() and .queue() yourself, like this: $("#myElem").show().delay(5000).queue(function(n) { $(this).hide(); n(); }); share | ...
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ASP.NET Web Site or ASP.NET Web Application?

...n you have pages or controls in one directory that need to reference pages and controls in another directory since the other directory may not be compiled into the code yet. Another problem can be in publishing. If Visual Studio isn't told to re-use the same names constantly, it will come up with ...
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Why do objects of the same class have access to each other's private data?

...specification, which is why it even has its own dedicated chapter in the standard (11.5). But still any per-object features described there are rather rudimentary. Again, access control in C++ is meant to work on per-class basis. ...