Tutorial by Examples: u

private List<FooBar> _fooBars; public List<FooBar> FooBars { get { return _fooBars ?? (_fooBars = new List<FooBar>()); } } The first time the property .FooBars is accessed the _fooBars variable will evaluate as null, thus falling through to the assignment statement ass...

Asynchronous ajax call With this type of ajax call, code does not wait for the call to complete. $('form.ajaxSubmit').on('submit',function(){ // initilization... var form = $(this); var formUrl = form.attr('action'); var formType = form.attr('method'); var formData ...

git clean -f Will remove all untracked files.

If you need to download files with git under a proxy, setting proxy server system-wide couldn't be enough. You could also try the following: git config --global http.proxy http://<proxy-server>:<port>/

New build systems can be created from the menu (Tools | Build System | New Build System). { "shell_cmd": "somecommand -u \"$file\"", "result_file_regex": "^[ ]*File \"(.*?)\"", "result_line_regex": "^[ ]*File ...

:q!

:q! ZQ

:wq!

module.exports.routes = { // sends matching regex (few patterns) as 'page' param 'r|/foo/([0-9]+)|page': 'FooController.get', 'r|/foo/(.*)|page': 'FooController.get', 'r|/foo/(\\w+)|page': 'FooController.get' };

To stop the Handler from execution remove the callback attached to it using the runnable running inside it: Runnable my_runnable = new Runnable() { @Override public void run() { // your code here } }; public Handler handler = new Handler(); // use 'new Handler(Looper.get...

In order to call a function through a function pointer, the function pointer's type must exactly match the function's type. Otherwise, the behaviour is undefined. Example: int f(); void (*p)() = reinterpret_cast<void(*)()>(f); p(); // undefined

To build up an expression like _ => _.Field == "VALUE" at runtime. Given a predicate _ => _.Field and a string value "VALUE", create an expression that tests whether or not the predicate is true. The expression is suitable for: IQueryable<T>, IEnumerable<T>...

Configuring the connection programmatically: var config = new ClientConfiguration { Servers = new List<Uri> { new Uri("http://localhost:8091/pools") }, BucketConfigs = new Dictionary<string, BucketConfiguration> ...

OOP - Object Oriented Programming is a vastly used programming paradigm in these days. In OOP, we model real world problems using Objects and there behaviors, in order to solve them, programmatically. There are four main OOP Concepts Inheritance Polymorphism Abstraction Encapsulation These...

To get the time at which your app was installed or updated, you should query Android's package manager. try { // Reference to Android's package manager PackageManager packageManager = this.getPackageManager(); // Getting package info of this application PackageInfo info = pack...

In Object Oriented Design, objects receive messages and reply to them. In Ruby, sending a message is calling a method and result of that method is the reply. In Ruby message passing is dynamic. When a message arrives rather than knowing exactly how to reply to it Ruby uses a predefined set of rules...

class Example def example_method :example end def subexample_method :example end def not_missed_method :example end def method_missing name return :example if name == :missing_example_method return :example if name == :missing_subexample_method ...

Ruby moves up on ancestors chain of an object. This chain can contain both modules and classes. Same rules about moving up the chain apply to modules as well. class Example end module Prepended def initialize *args return super :default if args.empty? super end end module Fi...

There are two ways to interrupt messages. Use method_missing to interrupt any non defined message. Define a method in middle of a chain to intercept the message After interrupting messages, it is possible to: Reply to them. Send them somewhere else. Modify the message or its result. ...

The Continue operator works in For, ForEach, While and Do loops. It skips the current iteration of the loop, jumping to the top of the innermost loop. $i =0 while ($i -lt 20) { $i++ if ($i -eq 7) { continue } Write-Host $I } The above will output 1 to 20 to the console but miss...