Tutorial by Examples: s

In the IF THEN ELSE statement the result can be either a single statement: DEFINE VARIABLE i AS INTEGER NO-UNDO. IF i = 0 THEN MESSAGE "Zero". ELSE MESSAGE "Something else". Or a block, for instance by adding a DO-block: DEFINE VARIABLE i AS INTEGER NO...

The CASE-statement is a lot more strict than the IF/ELSE-conditional. It can only compare a single variable and only equality, not larget/smaller than etc. DEFINE VARIABLE c AS CHARACTER NO-UNDO. CASE c: WHEN "A" THEN DO: RUN procedureA. END. WHEN "B" ...

IF THEN ELSE can also be used like a function to return a single value. This is a lot like the ternary ?-operator of C. DEFINE VARIABLE i AS INTEGER NO-UNDO. DEFINE VARIABLE c AS CHARACTER NO-UNDO. /* Set c to "low" if i is less than 5 otherwise set it to "high" c...

The DICOM Image file is a tagged image file; the file contains both an image (most of the time) and a collection of data about the image. The data in a DICOM image file is stored as a sequence of individual elements. Each element contains one item of information about the image or the image itself. ...

Installing Heroku Scheduler heroku addons:create scheduler:standard

Tweepy can be installed from its PyPI repository using pip or easy_install: pip install tweepy or easy_install tweepy You can also download the source from GitHub and install it using setup.py: python setup.py install See the tweepy documentation for more.

Here's a basic example of how to do a very simple class system Class = {} local __instance = {__index=Class} -- Metatable for instances function Class.new() local instance = {} setmetatable(instance, __instance) return instance -- equivalent to: return setmetatable({}, __instance)...

Having local Class = {} Class.__meta = {__index=Class} function Class.new() return setmetatable({}, Class.__meta) Assuming we want to change the behavior of a single instance object = Class.new() using a metatable, there are a few mistakes to avoid: setmetatable(object, {__call = table.conca...

Objective C AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc]init]; AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Some text"]; [utterance setRate:0.2f]; [synthesizer speakUtterance:utterance]; Swift let synthesizer = AVSpeechSynthesizer...

The Search API provides access to recent tweets*. This is as opposed to the Stream API, which provides search results in real-time. <example> *Note that "the Search API is focused on relevance and not completeness" - Twitter Search API

The Stream API provides access to tweets in real-time. Streams can be filtered based on keywords, language, location, and more. Here's a simple example to track mentions of the word "tweepy": #set up a new class using tweepy.StreamListener class SimpleListener(tweepy.StreamListener): ...

app.module.ts import {routes} from "./app.routes"; @NgModule({ declarations: [AppComponent], imports: [BrowserModule, mainModule.forRoot(), RouterModule.forRoot(routes)], providers: [], bootstrap: [AppComponent] }) export class AppModule { } app.routes.t...

There are 2 ways to set formBuilder controls parameters. On initialize: exampleForm : FormGroup; constructor(fb: FormBuilder){ this.exampleForm = fb.group({ name : new FormControl({value: 'default name'}, Validators.compose([Validators.required, Validators.maxLength(15)])) }); ...

Inside of your {CATALINA_HOME}/conf/ folder exists a server.xml and context.xml file. Each one of these contains similar code, but references different parts of Tomcat to complete the same task. server.xml is server-wide configuration. This is where you can set up HTTPS, HTTP2, JNDI Resources, etc....

public void test() { Connection conn = null; Statement stmt = null; try { Context ctx = (Context) new InitialContext().lookup("java:comp/env"); conn = ((DataSource) ctx.lookup("jdbc/SomeDataSource")).getConnection(); stmt = conn.createS...

The Wrong Way Consider the following structure { "users": { // Uniquely generated IDs for children is common practice, // it's actually really useful for automating child creation. // Auto-incrementing an integer for a key can be problematic when a child is removed. ...

The following is an example of a simple and minimal college database that uses two-way relationships { "students": { "-SL3Cs0KFvDMQLIYZEzv": { "name": "Godric Gryffindor", "id": "900130309", "courses"...

A common technique for using channels is to create some number of workers (or consumers) to read from the channel. Using a sync.WaitGroup is an easy way to wait for those workers to finish running. package main import ( "fmt" "sync" "time" ) func ...

Let's consider the below snippet, Get-ChildItem -Path C:\MyFolder | Select-Object Name, CreationTime, Length It simply output the folder content with the selected properties. Something like, What if I want to display the file size in KB ? This is where calcualted properties comes handy. Get-...

Unlike functions, there's no need to forward declare a procedure. It can be placed anywhere in your code, before or after you call it using RUN. RUN proc. //Procedure starts here PROCEDURE proc: //Procedure ends here END PROCEDURE. The procedure name is folowed by a colon sign telling u...