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What is the concept of erasure in generics in Java?
...lang.Object - the compiler generates extra casts where necessary. At execution time, a List<String> and a List<Date> are exactly the same; the extra type information has been erased by the compiler.
Compare this with, say, C#, where the information is retained at execution time, allowi...
How to deal with IntelliJ IDEA project files under Git source control constantly changing?
...s (.ipr and .iml) into source control so that we can share build configurations, settings, and inspections. Plus, we can then use those inspection settings on our continuous integration server with TeamCity. (We have the per-user workspace .iws file in the .gitignore file and not in source control.)...
Injecting $scope into an angular service function()
...e $rootScope).
The purpose of a Scope is to "glue together" the presentation and the business logic of your app. It does not make much sense to pass a $scope into a service.
Services are singleton objects used (among other things) to share data (e.g. among several controllers) and generally encap...
C# DLL config file
...
It is not trivial to create a .NET configuration file for a .DLL, and for good reason. The .NET configuration mechanism has a lot of features built into it to facilitate easy upgrading/updating of the app, and to protect installed apps from trampling each others config...
Does Python optimize tail recursion?
...Guido van Rossum prefers to be able to have proper tracebacks:
Tail Recursion Elimination (2009-04-22)
Final Words on Tail Calls (2009-04-27)
You can manually eliminate the recursion with a transformation like this:
>>> def trisum(n, csum):
... while True: # Chan...
What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
...ere you specify which gems you want to use, and lets you specify which versions.
The Gemfile.lock file is where Bundler records the exact versions that were installed. This way, when the same library/project is loaded on another machine, running bundle install will look at the Gemfile.lock and inst...
Redis key naming conventions?
What are the normal naming convention for keys in redis? I've seen values separated by : but I'm not sure what the normal convention is, or why.
...
Modify request parameter with servlet filter
An existing web application is running on Tomcat 4.1. There is an XSS issue with a page, but I can't modify the source. I've decided to write a servlet filter to sanitize the parameter before it is seen by the page.
...
How to validate phone numbers using regex
...rehensive regex to validate phone numbers. Ideally it would handle international formats, but it must handle US formats, including the following:
...
Execute and get the output of a shell command in node.js
... project I am working now.
var exec = require('child_process').exec;
function execute(command, callback){
exec(command, function(error, stdout, stderr){ callback(stdout); });
};
Example: Retrieving git user
module.exports.getGitUser = function(callback){
execute("git config --global user...