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Getting the difference between two sets
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Try this
test2.removeAll(test1);
Set#removeAll
Removes from this set all of its elements that are contained in the specified collection (optional operation). If the specified collection is also a set, this operation effectively modifies this set so that its value is the asymmetri...
What is the Swift equivalent to Objective-C's “@synchronized”?
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Great article from Matt Gallagher about this: cocoawithlove.com/blog/2016/06/02/threads-and-mutexes.html
– wuf810
Jul 29 '16 at 11:50
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The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead [dupl
When I attempt to connect to a MySQL server from PHP, I see the following error:
1 Answer
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Rails Observer Alternatives for 4.0
With Observers officially removed from Rails 4.0 , I'm curious what other developers are using in their place. (Other than using the extracted gem.) While Observers were certainly abused and could easily become unwieldily at times, there were many use-cases outside of just cache-clearing where they...
What's the absurd function in Data.Void useful for?
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this is a strict-ified and simplified version of the standard pipes type from Gabriel Gonzales' Pipes library. Now, we can encode a pipe that never yields (ie, a consumer) as
type Consumer a r = Pipe a Void r
this really never yields. The implication of this is that the proper fold rule for a...
create a trusted self-signed SSL cert for localhost (for use with Express/Node)
... Beautiful! This worked! I'd like to addition: Install OpenSSL from here: indy.fulgan.com/SSL/?C=M;O=A. Get the .cnf file from here: and then, configure it from here: gist.githubusercontent.com/pandurang90/dbe6a67339747ef5bacf/raw/… and configure openSSL from here: stackoverflow.com/...
Adding and removing style attribute from div with jquery
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You cannot remove the position or top attribute from the voltaic_holder element, because it does not have thos attributes. Those are css properties defined in the style attribute.
– Peter Olson
Mar 22 '11 at 17:02
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Find object by id in an array of JavaScript objects
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Use the find() method:
myArray.find(x => x.id === '45').foo;
From MDN:
The find() method returns the first value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
If you want to find its index instead, use findInd...
What difference is there between WebClient and HTTPWebRequest classes in .NET?
...if you want to get the content out of an HttpWebResponse, you have to read from the response stream:
var http = (HttpWebRequest)WebRequest.Create("http://example.com");
var response = http.GetResponse();
var stream = response.GetResponseStream();
var sr = new StreamReader(stream);
var content = sr...
How to declare global variables in Android?
...class and make it available for your entire application. You can access it from any context using the Context.getApplicationContext() method (Activity also provides a method getApplication() which has the exact same effect). Following is an extremely simplified example, with caveats to follow:
clas...