Tutorial by Examples: l

In HBase, you can use 4 types of operations Get : retrieves a row Put : inserts one or more row(s) Delete : delete a row Scan : retrieves several rows If you simply want to retrieve a row, given its row_key you can use the Get object: Get get = new Get(Bytes.toBytes("my_row_key")...

Basically, the Scan object retrieves all the rows from the table, but what if you want to retrieve only the rows where the value of a given column is equal to something ? Let me introduce you the Filters, they work like the WHERE in SQL. Before starting using the filters, if you know how your row_k...

(defn print-some-items [[a b :as xs]] (println a) (println b) (println xs)) (print-some-items [2 3]) This example prints the output 2 3 [2 3] The argument is destructured and the items 2 and 3 are assigned to the symbols a and b. The original argument, the entire vector [2 ...

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In the node JS command prompt, inside your loopback project, type the following command to create a new model. slc loopback:model If you have installed LoopBack CLI tool, you can create model with: lb model The command prompt will request informations about the model to create. In this examp...

console.dir(object) displays an interactive list of the properties of the specified JavaScript object. The output is presented as a hierarchical listing with disclosure triangles that let you see the contents of child objects. var myObject = { "foo":{ "bar":"d...

VBA supports 2 calendars : Gregorian and Hijri The Calendar property is used to modify or display the current calendar. The 2 values for the Calendar are: ValueConstantDescription0vbCalGregGregorian calendar (default)1vbCalHijriHijri calendar Example Sub CalendarExample() 'Cache the curren...

DateDiff() DateDiff() returns a Long representing the number of time intervals between two specified dates. Syntax DateDiff ( interval, date1, date2 [, firstdayofweek] [, firstweekofyear] ) interval can be any of the intervals defined in the DatePart() function date1 and date2 are the two ...

How To Install ANTLR in Eclipse (Last tested on Indigo and ANTLR IDE 2.1.2) Install Eclipse. Download ANTLR complete binaries jar that includes ANTLR v2. Extract to a temp directory. Copy the antlr-n.n folder to an appropriate permanent location, for example the same folder that Eclipse is in...

Generics became available with: .NET Framework 2.0 (and version 2.0 of the compact framework). Java in version 5. Common Lisp since it was standardised ...

Server Syntax var io = require('socket.io')(80); io.on('connection', function (mysocket) { //custom event called `private message` mysocket.on('private message', function (from, msg) { console.log('I received a private message by ', from, ' saying ', msg); }); //internal `di...

Suppose we want to read and stack a bunch of similarly-formatted files. The quick solution is: rbindlist(lapply(list.files(patt="csv$"), fread), id=TRUE) We might not be satisfied with this for a couple reasons: It might run into errors when reading with fread or when stacking with ...

Install node modules npm install express npm install socket.io Node.js server const express = require('express'); const app = express(); const server = app.listen(3000,console.log("Socket.io Hello Wolrd server started!")); const io = require('socket.io')(server); io.on('connec...

Open Graph is a standard for metadata that extends the normal information contained within a site's head markup. This enables websites such as Facebook to display deeper and richer information about a website in a structured format. This information is then automatically displayed when users share l...

Split vector of texts using one pattern: stri_split_fixed(c("To be or not to be.", "This is very short sentence.")," ") # [[1]] # [1] "To" "be" "or" "not" "to" "be." # # [[2]] # [1] "This" ...

This is an simple example to create a mysql server with docker 1.- create docker-compose.yml: Note: If you want to use same container for all your projects, you should create a PATH in your HOME_PATH. If you want to create it for every project you could create a docker directory in your project. ...

You want to convert all elements in an array to some other form. For example, you have theUsers = [ {id: 1, username: 'john'} {id: 2, username: 'lexy'} {id: 3, username: 'pete'} ] and you want to have an array of usernames only, i.e. ['john', 'lexy', 'pete'] Method 1 - using .map ...

theUsers = [ {id: 1, username: 'john'} {id: 2, username: 'lexy'} {id: 3, username: 'pete'} ] To retain only users whose id is greather than 2, use the following: [{id: 3, username: 'pete'}] Method 1 - using .filter filteredUsers = theUsers.filter (user) -> user.id >= 2 Met...

Alert is a simple popup that displays a set of buttons and gets an result depending on the button the user clicked: Example This lets the user decide, if (s)he really wants to close the primary stage: @Override public void start(Stage primaryStage) { Scene scene = new Scene(new Group(), 100...

[TestFixture] public class UnitTest1 { class Message { public string Text { get; } = "Hello World"; } [Test] public void HelloWorldTest() { // Act var message = new Message(); // Assert Assert.That(message.Tex...