Tutorial by Examples: sync

var expect = require("chai").expect; describe('Suite Name', function() { describe('#method()', function() { it('should run without an error', function(done) { testSomething(err => { expect(err).to.not.be.equal(null) done() }) }) }) }) ...

describe('Suite Name', function() { describe('#method()', function() { it('should run without an error', function() { return doSomething().then(result => { expect(result).to.be.equal('hello world') }) }) }) })

Adding a Product to a Shopping Cart The following example demonstrates how to Add a product (or anything) to a Database Table asynchronously, using AJAX, and TypeScript. declare var document; declare var xhr: XMLHttpRequest; window.onLoad = () => { Start(); }; function Start() { ...

Consider a simple asynchronous method: async Task Foo() { Bar(); await Baz(); Qux(); } Simplifying, we can say that this code actually means the following: Task Foo() { Bar(); Task t = Baz(); var context = SynchronizationContext.Current; t.ContinueWith(task...

To disable synchronization context you should call the ConfigureAwait method: async Task() Foo() { await Task.Run(() => Console.WriteLine("Test")); } . . . Foo().ConfigureAwait(false); ConfigureAwait provides a means to avoid the default SynchronizationContext capturi...

Consider this example: private void button1_Click(object sender, EventArgs e) { label1.Text = RunTooLong(); } This method will freeze UI application until the RunTooLong will be completed. The application will be unresponsive. You can try run inner code asynchronously: private void butt...

import React from 'react'; import { Route, IndexRoute } from 'react-router'; import Index from './containers/home'; import App from './components/app'; //for single Component lazy load use this const ContactComponent = () => { return { getComponent: (location, callback)=> { ...

public async Task<actionresult> Index() { return View("View", await db.UserMasers.ToListAsync()); }

Using async initialization is a recommended way for application development. It uses the OpenCV Manager to access OpenCV libraries externally installed in the target system. Code snippet implementing the async initialization: public class MainActivity extends Activity implements CvCameraViewListen...

If you don't want to extend Application and keep your toast messages thread safe, make sure you show them in the post execute section of your AsyncTasks. public class MyAsyncTask extends AsyncTask <Void, Void, Void> { @Override protected Void doInBackground(Void... params) { ...

One of the best features of async/await syntax is that standard try-catch coding style is possible, just like you were writing synchronous code. const myFunc = async (req, res) => { try { const result = await somePromise(); } catch (err) { // handle errors here } }); Here'...

It is a bad practice to block on async calls as it can cause deadlocks in environments that have a synchronization context. The best practice is to use async/await "all the way down." For example, the following Windows Forms code causes a deadlock: private async Task<bool> TryThis()...

The async pipe subscribes to an Observable or Promise and returns the latest value it has emitted. When a new value is emitted, the async pipe marks the component to be checked for changes. When the component gets destroyed, the async pipe unsubscribes automatically to avoid potential memory leaks. ...

The async package provides functions for asynchronous code. Using the auto function you can define asynchronous relations between two or more functions: var async = require('async'); async.auto({ get_data: function(callback) { console.log('in get_data'); // async code to ...

Consider the following code: public async Task MethodA() { await MethodB(); // Do other work } public async Task MethodB() { await MethodC(); // Do other work } public async Task MethodC() { // Or await some other async work await Task.Delay(100); } ...

probably the most common misconception about asnycio is that it lets you run any task in parallel - sidestepping the GIL (global interpreter lock) and therefore execute blocking jobs in parallel (on separate threads). it does not! asyncio (and libraries that are built to collaborate with asyncio) b...

with Ada.Containers.Synchronized_Queue_Interfaces; with Ada.Containers.Unbounded_Synchronized_Queues; with Ada.Text_IO; procedure Producer_Consumer_V1 is type Work_Item is range 1 .. 100; package Work_Item_Queue_Interfaces is new Ada.Containers.Synchronized_Queue_Interfaces ...

Some applications may want to create so-called "Fire & Forget" tasks which can be periodically triggered and do not need to return any type of value returned upon completion of the assigned task (for example, purging old temp files, rotating logs, autosaving state). In this example, w...

It is often necessary to execute a long-running task and use the result of that task once it has completed. In this example, we will create two classes: One which implements the Callable<T> interface (where T is the type we wish to return), and one which contains a main() method. AsyncValueT...

While good software design often maximizes code reusability, sometimes it can be useful to define asynchronous tasks inline in your code via Lambda expressions to maximize code readability. In this example, we will create a single class which contains a main() method. Inside this method, we will us...