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Converting newline formatting from Mac to Windows

...In conclusion, simply replace every occurence of \n by \r\n. Both unix2dos and dos2unix are not by default available on Mac OSX. Fortunately, you can simply use Perl or sed to do the job: sed -e 's/$/\r/' inputfile > outputfile # UNIX to DOS (adding CRs) sed -e 's/\r$//' inputfil...
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Why can I throw null in Java? [duplicate]

...erException. In other words, throw checks that its argument is nonnull, and if it is null, it throws a NullPointerException. JLS 14.18 specifies this behavior: If evaluation of the Expression completes normally, producing a null value, then an instance V' of class NullPointerException is cre...
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Not able to type in textfield in iphone simulator using Mac Keyboard?

I'm working on a basic iOS app which supports both portrait and landscape modes. When the iPhone simulator keyboard is open in landscape and I'm switching the app to portrait mode I'm unable to type anything in any text field using my Mac physical keyboard. ...
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Update MongoDB field using value of another field

...ion 4.2+ which allows using of aggregation pipeline in the update document and the updateOne, updateMany or update collection method. Note that the latter has been deprecated in most if not all languages drivers. MongoDB 4.2+ Version 4.2 also introduced the $set pipeline stage operator which is an...
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How do I set up a simple delegate to communicate between two view controllers?

I have two UITableViewControllers and need to pass the value from the child view controller to the parent using a delegate. I know what delegates are and just wanted to see a simple to follow example. ...
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Formula px to dp, dp to px android

...ing to calculate a variable amount of pixels to density independent pixels and vice-versa. 20 Answers ...
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How to remove focus around buttons on click

... I found this Q and A on another page, and overriding the button focus style worked for me. This problem may be specific to MacOS with Chrome. .btn:focus { outline: none; box-shadow: none; } Note though that this has implications for ...
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What is the difference between include and extend in Ruby?

...correct. However there is more to it than that. If you have a class Klazz and module Mod, including Mod in Klazz gives instances of Klazz access to Mod's methods. Or you can extend Klazz with Mod giving the class Klazz access to Mod's methods. But also you can extend an arbitrary object with o.exte...
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When should I use a List vs a LinkedList

...his should not be an accepted answer. As I was learning I did some tests and felt like sharing them. Original answer... I found interesting results: // Temporary class to show the example class Temp { public decimal A, B, C, D; public Temp(decimal a, decimal b, decimal c, decimal d) ...
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How to specify maven's distributionManagement organisation wide?

...istributionManagement> </project> This can be built, released, and deployed to your local nexus so everyone has access to its artifact. Now for all projects which you wish to use it, simply include this section: <parent> <groupId>your.company</groupId> <artifac...