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How to filter None's out of List[Option]?
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someList.filter(_.isDefined) if you want to keep the result type as List[Option[A]]
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How to fix bower ECMDERR
...e you might encounter the same issue...It turns out my machine behind firewall, that won't able to access git://github.com/jquery/jquery.git
Link: Unable to Connect to GitHub.com For Cloning
The solution without changing the firewall:
git config --global url."https://".insteadOf git://
Credit...
MongoDB: Combine data from multiple collections into one..how?
..., reduce;
db.users_comments.remove();
// setup sample data - wouldn't actually use this in production
db.users.remove();
db.comments.remove();
db.users.save({firstName:"Rich",lastName:"S",gender:"M",country:"CA",age:"18"});
db.users.save({firstName:"Rob",lastName:"M",gender:"M",country:"US",age:"25...
What is a “context bound” in Scala?
... Iterable[T]) =
xs zip ys map { t => implicitly[Numeric[T]].times(t._1, t._2) }
or
def **[T : Numeric](xs: Iterable[T], ys: Iterable[T]) =
xs zip ys map { t => context[T]().times(t._1, t._2) }
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Rotating a two-dimensional array in Python
...2]]
This list is passed into zip() using argument unpacking, so the zip call ends up being the equivalent of this:
zip([3, 4],
[1, 2])
# ^ ^----column 2
# |-------column 1
# returns [(3, 1), (4, 2)], which is a original rotated clockwise
Hopefully the comments make it clear what zip ...
Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly
...If you don't have a public key, Heroku will prompt you to add one automatically which works seamlessly. Just use:
heroku keys:add
To clear all your previous keys do :
heroku keys:clear
To display all your existing keys do :
heroku keys
EDIT:
The above did not seem to work for me. I had me...
What is a None value?
...n't write the sticker "F", there was already an F sticker on the None, and all you did was move it, from None to "fork". So when you type F = None, you're "reset[ting] it to its original, empty state", if we decided to treat None as meaning empty state.
I can see what he's getting at, but that's a...
How to get a key in a JavaScript object by its value?
...pt object, which I use as an associative array. Is there a simple function allowing me to get the key for a value, or do I have to iterate the object and find it out manually?
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How to publish a website made by Node.js to Github Pages?
...at is a project page.For project pages a special branch has to be created called gh-pages.Take a look at the gh-pages branch of the repository.It contains pure html files.So everything you see on the link is actually from the gh-pages branch.
– Akshat Jiwan Sharma
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How to load assemblies in PowerShell?
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While it is technically correct that LoadWithPartialNamehas been deprecated, the reasons (as outlined in blogs.msdn.com/b/suzcook/archive/2003/05/30/57159.aspx) clearly don't apply for an interactive Powershell session. I suggest you add a note...