Tutorial by Examples: ga

const r = require("rethinkdb"); r.connect({host: 'localhost', port: 28015}, (conn) => console.log(conn)) // Or as a promise let rdb_conn; r.connect({host: 'localhost', port: 28015}).then((conn) => { rdb_conn = conn; }).then(() => { // Continue to use rdb_conn }); ...

r.connect({host: 'localhost', port: 28015}) .then((conn) => { return r.dbList().run(conn); }).then((result) => { // Prints out list of databases on the RethinkDB instance console.log(result); });

r.connect({host: 'localhost', port: 28015}) .then((conn) => { // Can also use .get({id: 1}) return r.db("stackoverflow").table("examples").get(1).run(conn) }).then((result) => { console.log(result); })

import pygame background_colour = (255,255,255) # For the background color of your window (width, height) = (300, 200) # Dimension of the window screen = pygame.display.set_mode((width, height)) # Making of the screen pygame.display.set_caption('Tutorial 1') # Name for the window screen.fil...

Here is our function to create a simple ajax call written in vanilla javascript (not es2015): function ajax(url, callback) { var xhr; if(typeof XMLHttpRequest !== 'undefined') xhr = new XMLHttpRequest(); else { var versions = ["MSXML2.XmlHttp.5.0", ...

The following code can be found in a demo here: https://ellie-app.com/mbFwJT9jD3/0 import Html exposing (..) import Json.Decode exposing (Decoder) payload = """ [{ "id": 0, "name": "Adam Carter", "work": "Uni...

This can be done in 3 steps : You must define an elixir module which use Ecto.Repo and register your app as an otp_app. defmodule Repo do use Ecto.Repo, otp_app: :custom_app end You must also define some config for the Repo which will allow you to connect to the database. Here is an...

After a statement was executed, a call to sqlite3_reset() brings it back into the original state so that it can be re-executed. Typically, while the statement itself stays the same, the parameters are changed: const char *sql = "INSERT INTO MyTable(ID, Name) VALUES (?, ?)"; sqlite3_stmt...

To use an Asset Catalog, you need to do the following: Double-click the Info.plist file in the Solution Explorer to open it for editing. Scroll down to the App Icons section. From the Source dropdown list, ensure AppIcons is selected. From the Solution Explorer, double-click the Assets.xcasset...

If you have a moment object you can use add and substract to manipulate it or set any property of the time directly moment("2016-01-01").add(1, 'year').format('YYYY-MM-DD') // -> "2017-01-01" Or use .day(), .month(), .year(), .seconds(), .milliseconds() to set those val...

Each table view must have a delegate and a data source. Delegate Methods None of the delegate methods are actually required, however you'll need to implement tableView:didSelectRowAtIndexPath: to handle touches on a table cell: And other methods are... // Display customization - (void)tableVi...

Assuming you know the productID: First import StoreKit Then in your code let productID: Set = ["premium"] let request = SKProductsRequest(productIdentifiers: productID) request.delegate = self request.start() and in the SKProductsRequestDelegate: func productsRequest(request: ...

Image img = new Image(); BitmapImage bitmap = new BitmapImage(new Uri("ms-appx:///Path-to-image-in-solution-directory", UriKind.Absolute)); img.Source = bitmap;

Create new Xamarin.iOS blank project (Single View App). Right click on the "Components" folder and select "Get More Components": In search box type: "Flout Navigation" and add below component to your app: Remember also to add "Mono.Touch.D...

<a data-bind="attr: { href: myUrl }">link with dynamic href</a> ko.applyBindings({ myUrl: ko.observable("http://www.stackoverflow.com") }); Since there is no native href binding in KnockoutJS, you need to use a different feature to get dynamic links. The abo...

The simplest way to wrap and access a piece of state is Agent. The module allows one to spawn a process that keeps an arbitrary data structure and allows one to send messages to read and update that structure. Thanks to this the access to the structure is automatically serialized, as the process onl...

This example uses SqlConnection, but any IDbConnection is supported. Also any IDbTransaction is supported from the related IDbConnection. public void UpdateWidgetQuantity(int widgetId, int quantity) { using(var conn = new SqlConnection("{connection string}")) { conn.Open()...

A thing to look out for when using the toString method in Kotlin is the handling of null in combination with the String?. For example you want to get text from an EditText in Android. You would have a piece of code like: // Incorrect: val text = view.textField?.text.toString() ?: "" ...

Assuming you have already set up an app in Android Studio, add a ListView to a layout (or skip if that's already done): <?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/...

First step is create navigation interface which we will use on view model: public interface IViewNavigationService { void Initialize(INavigation navigation, SuperMapper navigationMapper); Task NavigateToAsync(object navigationSource, object parameter = null); Task GoBackAsync(); } ...