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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...
AngularJS : How to watch service variables?
...tyranny and overhead of $watch.
In the service:
factory('aService', function() {
var observerCallbacks = [];
//register an observer
this.registerObserverCallback = function(callback){
observerCallbacks.push(callback);
};
//call this when you know 'foo' has been changed
var notify...
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.
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Ember.js or Backbone.js for Restful backend [closed]
...
Contrary to popular opinion Ember.js isn't a 'more heavy weight approach' to Backbone.js. They're different kinds of tools that target totally different end products. Ember's sweet spot is applications where the user will keep the application open f...
Async image loading from url inside a UITableView cell - image changes to wrong image while scrollin
...myurl.com/%@.jpg", self.myJson[indexPath.row][@"movieId"]]];
NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
if (data) {
UIImage *image = ...
When should I choose Vector in Scala?
It seems that Vector was late to the Scala collections party, and all the influential blog posts had already left.
6 Answ...
Storing time-series data, relational or non?
...system which polls devices for data on varying metrics such as CPU utilisation, disk utilisation, temperature etc. at (probably) 5 minute intervals using SNMP. The ultimate goal is to provide visualisations to a user of the system in the form of time-series graphs.
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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...
Difference between wait() and sleep()
...ereas you call sleep on Thread.
Yet another point is that you can get spurious wakeups from wait (i.e. the thread which is waiting resumes for no apparent reason). You should always wait whilst spinning on some condition as follows:
synchronized {
while (!condition) { mon.wait(); }
}
...
How do I make an attributed string using Swift?
...g" needs to be attached to the numbers so that as the number size and position changes, the "g" "moves" with the numbers. I'm sure this problem has been solved before so a link in the right direction would be helpful as I've googled my little heart out.
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