Tutorial by Examples: u

From the GitHub repo of RxJava, RxJava is a Java VM implementation of Reactive Extensions: a library for composing asynchronous and event-based programs by using observable sequences. It extends the observer pattern to support sequences of data/events and adds operators that allow you to compose seq...

STUFF(Original_Expression, Start, Length, Replacement_expression) STUFF() function inserts Replacement_expression, at the start position specified, along with removing the characters specified using Length parameter. Select FirstName, LastName,Email, STUFF(Email, 2, 3, '*****') as StuffedEmail Fr...

Up to now we tried get request. (If you need to try other HTTP resquest, use some API testing tools like curl or postman) If you try sending a POST/PUT/DELETE to the resource, you find yourself getting “401 Unauthorized” errors. For safety, Tastypie ships with the authorization class set to ReadOnl...

This is an example of a basic GUI with two buttons that change a value stored in the GUI's handles structure. function gui_passing_data() % A basic GUI with two buttons to show a simple use of the 'handles' % structure in GUI building % Create a new figure. f = figure(); ...

Replace firebase values with your app api values: import firebase from 'firebase'; componentWillMount() { firebase.initializeApp({ apiKey: "yourAPIKey", authDomain: "authDomainNAme", databaseURL: "yourDomainBaseURL", projectId: "yourProjectID", ...

When performing data science tasks, it’s common to want to use data found on the internet. You’ll usually be able to access this data via an Application Programming Interface(API) or in other formats. However, there are times when the data you want can only be accessed as part of a web page. In case...

While using scrollviews in storyboard it's better to calculate content size according to number of views present in scrollview rather than giving content size programatically with static value. Here are the steps to get content size dynamically. Step 1 : Add Scrollview to view in storyboard and ...

Starting from react-native version 0.38, a Jest setup is included by default when running react-native init. The following configuration should be automatically added to your package.json file: "scripts": { "start": "node node_modules/react-native/local-cli/cli.js ...

For better performance it's important to avoid using of array (lambda) function in JSX. As explained at https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/jsx-no-bind.md : A bind call or arrow function in a JSX prop will create a brand new function on every single render. Th...

The Xamarin Forms Entry control does not have a MaxLength property. To achieve this you can extend Entry as below, by adding a Bindable MaxLength property. Then you just need to subscribe to the TextChanged event on Entry and validate the length of the Text when this is called: class CustomEntry ...

Gpars offers intuitive ways to handle tasks concurrently import groovyx.gpars.* GParsPool.withPool { def result = dataList.collectParallel { processItem(it) } }

With the help of react-navigation, you can add navigation to your app really easy. Install react-navigation npm install --save react-navigation Example: import { Button, View, Text, AppRegistry } from 'react-native'; import { StackNavigator } from 'react-navigation'; const App = StackNavigat...

import * as Redux from 'redux'; import {Inject, Injectable} from '@angular/core'; @Injectable() export class exampleService { constructor(@Inject(AppStore) private store: Redux.Store<AppState>) {} getExampleState(){ console.log(this.store.getState().example); } } ...

app.store.ts import {InjectionToken} from '@angular/core'; import {createStore, Store, compose, StoreEnhancer} from 'redux'; import {AppState, default as reducer} from "../app.reducer"; export const AppStore = new InjectionToken('App.store'); const devtools: ...

MCVE's should start the Shiny app when they are copied in the console. An easy way to do this is using the shinyApp function. For example: why is my checkbox not responding? library(shiny) ui <- fluidPage( checkboxInput('checkbox', 'click me'), verbatimTextOutput('text') ) serv...

In practice, shiny Apps are often very complicated and full of features that have been developed over time. More often than not, those additional details are not necessary to reproduce your issue. It is best if you skip such details when writing MCVE's. WRONG Why is my plot not showing? libra...

The simplest way to include plots in your shinyApp is to use plotOutput in the ui and renderPlot in the server. This will work with base graphics as well as ggPlots library(shiny) library(ggplot2) ui <- fluidPage( plotOutput('myPlot'), plotOutput('myGgPlot') ) server <- function...

animated_android_dialog_box.xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="16dp"> &...

Here is an example of image pulling using Go and Docker Engine API and the same progress bars as the ones shown when you run docker pull your_image_name in the CLI. For the purposes of the progress bars are used some ANSI codes. package yourpackage import ( "context" "en...

When using cURL for some queries to the Docker API, it might be a bit tricky to pass some complex structures. Let's say, getting a list of images allows using filters as a query parameter, which have to be a JSON representation of map[string][]string (about the maps in Go you can find more here). H...