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Clear a terminal screen for real
...== ESC
So this becomes <ESC>c which is the VT100 escape code for resetting the terminal. Here is some more information on terminal escape codes.
Edit
Here are a few other ways of doing it...
printf "\ec" #\e is ESC in bash
echo -en "\ec" #thanks @Jonathon Reinhart.
# -e Enable interpre...
JavaScript: Is there a way to get Chrome to break on all errors?
...ate. Use the link above ^
(link replaced by edited above) - you can now set it to break on all exceptions or just unhandled ones. (Note that you need to be in the Sources tab to see the button.)
Chrome's also added some other really useful breakpoint capabilities now, such as breaking on DOM cha...
What is the difference between getFields and getDeclaredFields in Java reflection
... True unless the code is written to use reflection to change the scope via setAccessible and there is no Security Manager in place
– John B
Jun 6 '13 at 16:11
...
convert_tz returns null
...
Apart from Windows environment, You can set Time Zone by
mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql
In Windows environment,
1. download Time zone description tables from http://dev.mysql.com/downloads/timezones.html
2. Stop MySQL server
...
List of Big-O for PHP functions
...sts at N=1 and N=1,000,000 is ~50% time increase.
Interesting Points:
isset/array_key_exists is much faster than in_array and array_search
+(union) is a bit faster than array_merge (and looks nicer). But it does work differently so keep that in mind.
shuffle is on the same Big-O tier as array_ran...
When to use a “has_many :through” relation in Rails?
...he recommendation reads:
The simplest rule of thumb is that you should set up a has_many :through relationship if you need to work with the relationship model as an independent entity. If you don’t need to do anything with the relationship model, it may be simpler to set up a has_and_belongs_t...
What is the difference between the $parse, $interpolate and $compile services?
...essions (name, extension) against a scope. It can be used to both read and set values for a given expression. For example, to evaluate the name expression one would do: $parse('name')($scope) to get the "image" value. To set the value one would do: $parse('name').assign($scope, 'image2')
All those...
What's the simplest way to test whether a number is a power of 2 in C++?
...
A power of two will have just one bit set (for unsigned numbers). Something like
bool powerOfTwo = !(x == 0) && !(x & (x - 1));
Will work fine; one less than a power of two is all 1s in the less significant bits, so must AND to 0 bitwise.
As I was...
What's the dSYM and how to use it? (iOS SDK)
...SYM is generated by default for a release version.
You can check it:
Build Settings -> Generate Debug Symbols -> Yes
Build Settings -> Debug Information Format -> DWARF with dSYM File
The result location you can find in Products folder
To generate dSYM file manually from .app using dsym...
SQL Server SELECT into existing table
...:
DECLARE @COLUMN_LIST NVARCHAR(MAX);
DECLARE @SQL_INSERT NVARCHAR(MAX);
SET @COLUMN_LIST = (SELECT DISTINCT
SUBSTRING(
(
SELECT ', table1.' + SYSCOL1.name AS [text()]
FROM sys.columns SYSCOL1
WHERE SYSCOL1.object_id = SYSCOL2.object_id and SYSCOL1....