Tutorial by Examples: l

Setting the application icon badge number

Use the following piece of code to set the badge number from within your application (suppose someNumber has been declared before): Objective-C [UIApplication sharedApplication].applicationIconBadgeNumber = someNumber; Swift UIApplication.shared.applicationIconBadgeNumber = someNumber In order ...

iOS • Push Notifications

URL slugs

module.exports.routes = { 'GET /blog/:year/:month/:day/:posttitle/': 'BlogController.showPost', 'GET /blog/:year/:month/:day/': 'BlogController.showDayArchive', 'GET /blog/:year/:month/': 'BlogController.showMonthArchive', 'GET /blog/:year/': 'BlogController.showYearArchive', }; The ...

sails.js • Routing

Installation Guide

There's an installation guide for running a JIRA Server under Windows or Linux / Mac ( see Installing JIRA applications) For local testing there's an SDK, which starts a JIRA test instance and can be used to develop JIRA Plugins (see Set up the Atlassian Plugin SDK and Build a Project)

jira • Getting started with jira

Stateful Component

These components will have changing States. import React, { Component } from 'react' import { View, Text, AppRegistry } from 'react-native' class Example extends Component { constructor (props) { super(props) this.state = { name: "Sriraman" } } render ...

react-native • Components

Stateless Component

As the name implies, Stateless Components do not have any local state. They are also known as Dumb Components. Without any local state, these components do not need lifecycle methods or much of the boilerplate that comes with a stateful component. Class syntax is not required, you can simply do con...

react-native • Components

Pitfall - Overloading instead of overriding

Consider the following example: public final class Person { private final String firstName; private final String lastName; public Person(String firstName, String lastName) { this.firstName = (firstName == null) ? "" : firstName; this.lastName = (lastN...

Java Language • Java Pitfalls - Language syntax

Using .PHONY for non-files targets

Use .PHONY to specify the targets that are not files, e.g., clean or mrproper. Good example .PHONY: clean clean: rm *.o temp Bad example clean: rm *.o temp In the good example make knows that clean is not a file, therefore it will not search if it is or not up to date and will ex...

makefile • .PHONY target

Installation or Setup

Detailed instructions on getting core-bluetooth set up or installed.

core-bluetooth • Getting started with core-bluetooth

Hello World!

"Hello World!" Also, check out the detailed discussion of how, when, whether and why to print a string.

R Language • Getting started with R Language

Drawing two rectangles on a

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Draw two rectangles on the canvas</title> <style> canvas{ border:1px solid gray; } </style> <script async...

HTML • Canvas

Hello world!

import React, { Component } from 'react'; import { AppRegistry, Text } from 'react-native'; class HelloWorldApp extends Component { render() { return ( <Text>Hello world!</Text> ); } } AppRegistry.registerComponent('HelloWorldApp', () => HelloWorldApp); ...

react-native • Hello World

Adding multiple dependencies

You can add multiple dependencies. task A << { println 'Hello from A' } task B << { println 'Hello from B' } task C << { println 'Hello from C' } task D << { println 'Hello from D' } Now you can define a set of dependencies: B.dependsOn A...

gradle • Task dependencies

Multiple dependencies with the dependsOn method

You can add multiple dependencies. task A << { println 'Hello from A' } task B(dependsOn: A) << { println 'Hello from B' } task C << { println 'Hello from C' } task D(dependsOn: ['B', 'C'] << { println 'Hello from D' } The output is: >...

gradle • Task dependencies

Remote module RMI

The remote module allows simple RMI (remote method invocation) of main process objects from renderer process. First create the main process in index.js const {app, BrowserWindow} = require('electron') let win = null app.on('ready', () => { win = new BrowserWindow() win.loadURL(`file://...

electron • Main and renderer process.

Installation and Setup

To install React Router, just run the npm command npm install --save react-router And you're done. This is literally all you have to do to install react router. Please Note : react-router is dependent on react, So make sure you install react as well. To set up: using an ES6 transpiler, like bab...

React Router • Getting started with React Router

Exporting .csv files

Exporting using base R Data can be written to a CSV file using write.csv(): write.csv(mtcars, "mtcars.csv") Commonly-specified parameters include row.names = FALSE and na = "". Exporting using packages readr::write_csv is significantly faster than write.csv and does not ...

R Language • Reading and writing tabular data in plain-text files (CSV, TSV, etc.)

Default compositing: New shapes are drawn over Existing shapes

context.globalCompositeOperation = "source-over" "source-over" compositing [default], places all new drawings over any existing drawings. context.globalCompositeOperation='source-over'; // the default context.drawImage(background,0,0); context.drawImage(parachuter,0,0); ...

html5-canvas • Compositing

Clip images inside shapes with "destination-in"

context.globalCompositeOperation = "destination-in" "destination-in" compositing clips existing drawings inside a new shape. Note: Any part of the existing drawing that falls outside the new drawing is erased. context.drawImage(picture,0,0); context.globalCompositeOperation...

html5-canvas • Compositing

Clip images inside shapes with "source-in"

context.globalCompositeOperation = "source-in"; source-in compositing clips new drawings inside an existing shape. Note: Any part of the new drawing that falls outside the existing drawing is erased. context.drawImage(oval,0,0); context.globalCompositeOperation='source-in'; // pictu...

html5-canvas • Compositing

Detect errors when writing a value on Android

There are many reasons a write operation may fail. A frequent one is because your security rules reject the operation, for example because you're not authenticated (by default a database can only be accessed by an authenticated user). You can see these security rule violations in the logcat output....

firebase • How do I listen for errors when accessing the database?