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What is the Scala annotation to ensure a tail recursive function is optimized?
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From the "Tail calls, @tailrec and trampolines" blog post:
In Scala 2.8, you will also be able to use the new @tailrec annotation to get information about which methods are optimised.
This annotation lets you mark sp...
How do I rename all folders and files to lowercase on Linux?
... The second one worked for me on Solaris by removing the -T from the mv command.
– Ham
Feb 21 '12 at 12:35
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show 7 more comm...
What exactly is an Assembly in C# or .NET?
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Assemblies are distinct from the files that contain them.
– Greg D
Sep 1 '09 at 13:16
1
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Clearing a string buffer/builder after loop
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I think the performance benefit comes from the string mutability, not from saving the instantiation. here's a quick test of 1e8 iterations: inside loop (2.97s): ideone.com/uyyTL14w, outside loop (2.87s): ideone.com/F9lgsIxh
– Mark Elliot
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How do I get the current date and time in PHP?
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You can get all the time zone from here Time Zone
– Yousef Altaf
Jan 5 '15 at 12:17
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django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named MySQLdb
... In order fix this problem do following steps:
Download MySql for Python from here
Untar downloaded file. In terminal window do following: tar xvfz downloade.tar.
cd /to untared directory
Run sudo python setup.py install
If you get error something like this: "Environment Error: /usr/local/bin/mysq...
What happens if you don't commit a transaction to a database (say, SQL Server)?
...ot yet commit. then in the other window you can see how the database looks from outside the transaction. Depending on the isolation level, the table may be locked until the first window is committed, or you might (not) see what the other transaction has done so far, etc.
Play around with the differ...
How does HashSet compare elements for equality?
...ng instead of just equality comparisons, you should use SortedSet<T> from .NET 4 - which allows you to specify an IComparer<T> instead of an IEqualityComparer<T>. This will use IComparer<T>.Compare - which will delegate to IComparable<T>.CompareTo or IComparable.Compare...
JavaScript: clone a function
...modern ( >=iE9 ) feature of JavaScript (with a compatibility workaround from MDN)
Notes
It does not clone the function object additional attached properties, including the prototype property. Credit to @jchook
The new function this variable is stuck with the argument given on bind(), even on ne...
Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?
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False is a bool. It has a different type. It is a different object from 0 which is an integer.
0 == False returns True because False is cast to an integer. int(False) returns 0
The python documentation of the == operator says (help('==')):
The operators <, >, ==, >=, <=, an...