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Set operations (union, intersection) on Swift array?

Are there any standard library calls I can use to either perform set operations on two arrays, or implement such logic myself (ideally as functionally and also efficiently as possible)? ...
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Python constructors and __init__

Why are constructors indeed called "Constructors"? What is their purpose and how are they different from methods in a class? ...
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Is there a Google Keep API? [closed]

... No there isn't. If you watch the http traffic and dump the page source you can see that there is an API below the covers, but it's not published nor available for 3rd party apps. Check this link: https://developers.google.com/gsuite/products for updates. However, there...
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How to add custom validation to an AngularJS form?

I have a form with input fields and validation setup by adding the required attributes and such. But for some fields I need to do some extra validation. How would I "tap in" to the validation that FormController controls? ...
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passing several arguments to FUN of lapply (and others *apply)

...n the lapply call as an argument, like so: lapply(input, myfun, arg1=6) and lapply, recognizing that arg1 is not an argument it knows what to do with, will automatically pass it on to myfun. All the other apply functions can do the same thing. An addendum: You can use ... when you're writing you...
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How can I mark “To Do” comments in Xcode?

...se //FIXME: or #warning. when you use #warning, you got a warning in Xcode and you can jump directly to that part. – brush51 Jun 4 '13 at 8:48 6 ...
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What character encoding should I use for a HTTP header?

...e http://html5boilerplate.com/ for more info) for a Server HTTP-header and am wondering if it is "allowed" per spec. 2 ...
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mkdir -p functionality in Python [duplicate]

...ution other than a system call. I am sure the code is less than 20 lines, and I am wondering if someone has already written it? ...
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Checking in packages from NuGet into version control?

...o enable your projects to support pack restore you need to run another command: Enable-PackageRestore Now you are ready to commit your code base without the packages folder. The previous command changed your project files so that if packages are missing they get automatically downloaded and added...
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Why do you need ./ (dot-slash) before executable or script name to run it in bash?

...Unix, usually, the current directory is not in $PATH. When you type a command the shell looks up a list of directories, as specified by the PATH variable. The current directory is not in that list. The reason for not having the current directory on that list is security. Let's say you're root and...