Tutorial by Examples: el

Hello World

A hello world topic should consist of the most basic, complete, runnable, starter program available, that may be achieved by the widest amount of versions of the language, framework or system being documented. If necessary, the remarks should include basic instructions on how to prepare and execute ...

Documentation • Getting started with Documentation

Blur Filters: feGaussianBlur (x-axis and y-axis blur set separately)

SVG • Filters

Getting current battery level

// Get the battery API navigator.getBattery().then(function(battery) { // Battery level is between 0 and 1, so we multiply it by 100 to get in percents console.log("Battery level: " + battery.level * 100 + "%"); });

JavaScript • Battery Status API

Get time left until battery is empty

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will drain in ", battery.dischargingTime, " seconds" ); });

JavaScript • Battery Status API

Get time left until battery is fully charged

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will get fully charged in ", battery.chargingTime, " seconds" ); });

JavaScript • Battery Status API

Insert mixed data into a JSON field.

This inserts a json dictionary where one of the members is an array of strings into the table that was created in another example. INSERT INTO myjson(dict) VALUES('{"opening":"Sicilian","variations":["pelikan","dragon","najdorf"]}'); ...

MySQL • JSON

Updating a JSON field

In the previous example we saw how mixed data types can be inserted into a JSON field. What if we want to update that field? We are going to add scheveningen to the array named variations in the previous example. UPDATE myjson SET dict=JSON_ARRAY_APPEND(dict,'$.variations','schevening...

MySQL • JSON

Wait for DOM to be loaded

Use DOMContentLoaded when the <script> code interacting with DOM is included in the <head> section. If not wrapped inside the DOMContentLoaded callback, the code will throw errors like Cannot read something of null document.addEventListener('DOMContentLoaded', function(event) { ...

DOM • Getting started with DOM

Multiple Lines/Curves in the Same Plot

""" ================================================================================ DRAW MULTIPLE LINES IN THE SAME PLOT ================================================================================ """ import matplotlib.pyplot as plt ...

matplotlib • Multiple Plots

Akka hello world (Scala)

Add akka-actor dependency (SBT example) libraryDependencies += "com.typesafe.akka" % "akka-actor_2.11" % "2.4.8" Create actor classes: Actor for string output: class OutputActor extends Actor { override def receive: Receive = { case message => p...

akka • Hello world

Show help file

The Help Class encapsulates the HTML Help 1.0 engine. You can use the Help object to show compiled Help files (.chm) or HTML files in the HTML Help format. Compiled Help files provide table of contents, index, search, and keyword links in pages. Shortcuts work only in compiled Help files. You can ge...

winforms • Help Integration

Delete row(s) from the table

To delete all rows from the table //get writable database SQLiteDatabase db = openHelper.getWritableDatabase(); db.delete(TABLE_NAME, null, null); db.close(); To delete all rows from the table and get the count of the deleted row in return value //get writable database SQLiteDatabase db =...

Android • SQLite

Hello World

Requirements A version of the Haxe toolkit must be installed Haxe must be present in your system path Command line must be accessible Code Navigate to a desired project directory and create a Test.hx source file with the following content: class Test { static function main() { ...

haxe • Getting started with haxe

Getting Help

To get help on a batch file command you can use the built-in help. Open a command prompt (whose executable is cmd.exe) and enter help to see all available commands. To get help for any of these commands, type help followed by the name of the command. For example: help help Will display: Prov...

batch-file • Getting started with batch-file

Other Development Tools

# install node-inspector terminal-a$ npm install -g node-inspector # start meteor terminal-a$ cd helloworld terminal-a$ NODE_OPTIONS='--debug-brk --debug' mrt run # alternatively, some people report this syntax being better terminal-a$ sudo NODE_OPTIONS='--debug' ROOT_URL=http://hellow...

meteor • Full Installation - Mac OSX

Selecting a certain line from a list based on a word in certain location

I have the following list: 1. Alon Cohen 2. Elad Yaron 3. Yaron Amrani 4. Yogev Yaron I want to select the first name of the guys with the Yaron surname. Since I don't care about what number it is I'll just put it as whatever digit it is and a matching dot and space after it from the beginni...

Regular Expressions • Matching Simple Patterns

Horizontal and Vertical centering using table layout

One could easily center a child element using table display property. HTML <div class="wrapper"> <div class="parent"> <div class="child"></div> </div> </div> CSS .wrapper { display: table; vertica...

CSS • Centering

Hello World

To send a remote command via SSH (the SSH server needs to be running on the remote host), you can simply write the command after user@machine. ssh [email protected] echo 'Hello World' Hello World It returns back the output to the sender, executed on the remote host.

Secure Shell • Remote commands

Hello World

The following simple procedure displays the text "Hello World" in a client that supports dbms_output. CREATE OR REPLACE PROCEDURE helloworld AS BEGIN dbms_output.put_line('Hello World!'); END; / You need to execute this at the SQL prompt to create the procedure in the database,...

plsql • PLSQL procedure

Hello World

set serveroutput on DECLARE message constant varchar2(32767):= 'Hello, World!'; BEGIN dbms_output.put_line(message); END; / Command set serveroutput on is required in SQL*Plus and SQL Developer clients to enable the output of dbms_output. Without the command nothing is displayed. T...

plsql • Getting started with plsql