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Can someone explain the traverse function in Haskell?
...onstructors are called in applicative style. This means that we can have (side-)effects while rebuilding the tree. Applicative is almost the same as monads, except that effects cannot depend on previous results. In this example it means that you could not do something different to the right branch o...
How do I avoid the specification of the username and password at every git push?
..., go to settings and click 'add SSH key'. Copy the contents of your ~/.ssh/id_rsa.pub into the field labeled 'Key'.
If your repository is administered by somebody else, give the administrator your id_rsa.pub.
If your remote repository is administered by your, you can use this command for example:
...
Why all the Active Record hate? [closed]
...> :company )
This generates SQL with LEFT JOIN companies on companies.id = person.company_id, and automatically generates associated Company objects so you can do people.first.company and it doesn't need to hit the database because the data is already present.
@pix0r
The inherent probl...
Which method performs better: .Any() vs .Count() > 0?
...tion (on ~200.000 records):
con = db.Contacts.
Where(a => a.CompanyId == companyId && a.ContactStatusId <= (int) Const.ContactStatusEnum.Reactivated
&& !a.NewsletterLogs.Any(b => b.NewsletterLogTypeId == (int) Const.NewsletterLogTypeEnum.Unsubscr)
).OrderBy(...
scp (secure copy) to ec2 instance without password
...n the wrong order. This works:
scp -i mykey.pem somefile.txt root@my.ec2.id.amazonaws.com:/
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Calculating sum of repeated elements in AngularJS ng-repeat
...
one downside to this is that it iterates over the collection twice. this is fine for small collections, but what if the collection is rather large? it seems like in ng-repeat there should be a way to have a running sum on a given ob...
Print only?
...which I have verified to work.
@media print {
body * {
visibility: hidden;
}
#section-to-print, #section-to-print * {
visibility: visible;
}
#section-to-print {
position: absolute;
left: 0;
top: 0;
}
}
Alternative approaches aren't so good. Using display is tricky ...
Retain cycle on `self` with blocks
I'm afraid this question is pretty basic, but I think it's relevant to a lot of Objective-C programmers who are getting into blocks.
...
Return rows in random order [duplicate]
...
SELECT * FROM table
ORDER BY NEWID()
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How to hide Bootstrap modal with javascript?
...e browser window, use the browser's console to try
$('#myModal').modal('hide');
If it works (and the modal closes) then you know that your close Javascript is not being sent from the server to the browser correctly.
If it doesn't work then you need to investigate further on the client what is h...