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How to define optional methods in Swift protocol?
...an take advantage of powerful generics system.
You can always be sure that all requirements are met when encountering types that conform to such protocol. It's always either concrete implementation or default one. This is how "interfaces" or "contracts" behave in other languages.
Disadvantages
F...
Using scp to copy a file to Amazon EC2 instance?
...ing the user to be ec2-user, e.g.
scp -i myAmazonKey.pem phpMyAdmin-3.4.5-all-languages.tar.gz ec2-user@mec2-50-17-16-67.compute-1.amazonaws.com:~/.
See Connecting to Linux/UNIX Instances Using SSH.
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Python non-greedy regexes
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You seek the all-powerful *?
From the docs, Greedy versus Non-Greedy
the non-greedy qualifiers *?, +?, ??, or {m,n}? [...] match as little
text as possible.
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Postgresql - unable to drop database because of some auto connections to DB
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(and possibly other users/roles; see \l+ in psql)
You can then terminate all connections to this db except your own:
SELECT pid, pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname = current_database() AND pid <> pg_backend_pid();
On older versions pid was called procpid so you'...
Best Practice: Initialize JUnit class fields in setUp() or at declaration?
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If you're wondering specifically about the examples in the JUnit FAQ, such as the basic test template, I think the best practice being shown off there is that the class under test should be instantiated in your setUp method (or in a test method).
When ...
Interface or an Abstract Class: which one to use?
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I was trying all day to understand the usages of abstract and interface classes, your post made it all clear. Thanks a lot Alan
– afarazit
May 21 '11 at 12:51
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How to select records from last 24 hours using SQL?
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If the records are stored as DATETIME, this will select all records from the previous date, disregarding the time part. Been run at 23:59:59, the query will return all records for the last 48 hours, not 24.
– Quassnoi
Dec 11 '09 at 15:02
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ReactJS: Modeling Bi-Directional Infinite Scrolling
...following:
Overview
Make a <List> component that takes an array of all children. Since we do not render them, it's really cheap to just allocate them and discard them. If 10k allocations is too big, you can instead pass a function that takes a range and return the elements.
<List>
{...
Multiple submit buttons on HTML form – designate one button as default [duplicate]
... managed to push the next button to the right by (1) floating it right (2) all other buttons floated left (3) all buttons displayed block (4) all buttons, including next button, specified in source order.
– Salman A
Dec 26 '09 at 14:56
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Listing only directories in UNIX
... of ls isn't used. Similar to the behaviour of ls *php and how it displays all files ending with php in a directory.
– David Hancock
Oct 18 '13 at 15:24
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