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Why do we use $rootScope.$broadcast in AngularJS?
... scope of that app can catch it using a simple: $scope.$on().
It is especially useful to send events when you want to reach a scope that is not a direct parent (A branch of a parent for example)
!!! One thing to not do however is to use $rootScope.$on from a controller. $rootScope is the applicati...
What is Inversion of Control?
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The Inversion of Control (IoC) and Dependency Injection (DI) patterns are all about removing dependencies from your code.
For example, say your application has a text editor component and you want to provide spell checking. Your standard code would look something like this:
public class TextEditor ...
List files in local git repo?
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This command:
git ls-tree --full-tree -r --name-only HEAD
lists all of the already committed files being tracked by your git repo.
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Make xargs execute the command once for each line of input
...per command line.
Trailing blanks cause an input line to be logically continued on
the next input line. Implies -x.
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Redis strings vs Redis hashes to represent JSON: efficiency?
I want to store a JSON payload into redis. There's really 2 ways I can do this:
3 Answers
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Why is an int in OCaml only 31 bits?
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This is called a tagged pointer representation, and is a pretty common optimization trick used in many different interpreters, VMs and runtime systems for decades. Pretty much every Lisp implementation uses them, many Smalltalk VMs, m...
Memcache(d) vs. Varnish for speeding up 3 tier web architecture
...ache will provide info for pages that have a mixture of known and new data allowing you to generate pages faster.
An example that could apply to stackoverflow.com: adding this comment invalidated the page cache, so this page would have to be cleared from Varnish (and also my profile page, which pr...
git -> show list of files changed in recent commits in a specific directory
...n. If you need a comprehensive list of commits, try making the number unusually large, like -1000 or more as needed.
– Julian Soro
Jan 8 '15 at 20:07
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postgresql return 0 if returned value is null
...ns the first of its arguments that is not null.
Null is returned only if all arguments are null. It is often
used to substitute a default value for null values when data is
retrieved for display.
Edit
Here's an example of COALESCE with your query:
SELECT AVG( price )
FROM(
SELECT *, cum...
Is it safe to ignore the possibility of SHA collisions in practice?
...rgued that any unlucky event with a probability lower than that is not actually very important.
If we have a "perfect" hash function with output size n, and we have p messages to hash (individual message length is not important), then probability of collision is about p2/2n+1 (this is an approximat...