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Rails Observer Alternatives for 4.0
...ctive Support Instrumentation
ActiveSupport::Notifications.instrument "my.custom.event", this: :data do
# do your stuff here
end
ActiveSupport::Notifications.subscribe "my.custom.event" do |*args|
data = args.extract_options! # {:this=>:data}
end
...
MySQL - How to select data by string length
...ing length(*fieldname*)=*fieldlength*
Example if you want to select from customer the entry's with a name shorter then 2 chars.
select * from customer where 1 **having length(name)<2**
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Install Marketplace plugin on Eclipse Juno
...asy way to add Eclipse MarketPlace
1. Go to http://eclipse.org/mpc/archive.php and download mpc zip for your eclipse.
2. Than go to Eclipse -> Help -> Install New Software and Add and select Archive file Location
then press ok, it will check dependency and install it.
And Enjoy....
...
What is the difference between compare() and compareTo()?
... I don't know why 'Comparable' is for natural ordering? We can customize it, can't we?
– c-an
Aug 26 '18 at 4:56
add a comment
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Referring to the null object in Python
...om/presentations/…. Other options instead of null are Options, or Maybe (custom) types.
– Michael Trouw
Apr 8 '15 at 23:56
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When should I use Debug.Assert()?
...an unexpected error in the
code. For example, if the system assumes that a customer-information
file will never have more than 50,000 records, the program might
contain an assertion that the number of records is lessthan or equal
to 50,000. As long as the number of records is less than or equal to
5...
When should I use Kruskal as opposed to Prim (and vice versa)?
...in a very straightforward way : http://www.thestudentroom.co.uk/showthread.php?t=232168.
Kruskal's algorithm will grow a solution from the cheapest edge by adding the next cheapest edge, provided that it doesn't create a cycle.
Prim's algorithm will grow a solution from a random vertex by adding ...
What is the purpose of the HTML “no-js” class?
...te engines, in the HTML5 Boilerplate , in various frameworks and in plain php sites there is the no-js class added onto the <HTML> tag.
...
How to rethrow InnerException without losing stack trace in C#?
...trace preserving functions:
// usage (A): cross-thread invoke, messaging, custom task schedulers etc.
catch (Exception e)
{
PreserveStackTrace (e) ;
// store exception to be re-thrown later,
// possibly in a different thread
operationResult.Exception = e ;
}
// usage (B): after ca...
What are markers in Java Logging frameworks and what is a reason to use them?
...dvent of Markers, to achieve similar behavior, you had the option 1) using custom levels 2) use modified logger names. SLF4J API currently does not support custom levels. As for option 2, suffixing (or prefixing) logger names is workable if a one or two loggers need to be modified. The approach beco...