Tutorial by Examples: e

Creating a Stack class with a List Object

Using a list object you can create a fully functional generic Stack with helper methods such as peeking and checking if the stack is Empty. Check out the official python docs for using list as Stack here. #define a stack class class Stack: def __init__(self): self.items = [] ...

Python Language • Stack

Creating a Chat Session and sending a message

Smack (Java) Using Smack 4.1 It is recommended to include Smack as Maven dependency in your project (e.g. by using gradle or Maven). Otherwhise the following Smack artifacts/jars have to be added manually to the classpath: smack-core, smack-extensions, smack-experimental, smack-im, smnack-tcp,...

xmpp • Getting started with xmpp

Installation or Setup

Detailed instructions on getting gerrit set up or installed.

gerrit • Getting started with gerrit

Connecting from script using password

When you really need to script ssh connection, piping the password into the ssh command does not work (echo passw0rd | ssh host). It is because the password is not read from standard input, but directly from TTY (teleprinter, teletypewriter, Teletype for historical reasons). But there is sshpass to...

Secure Shell • Getting started with Secure Shell

Getting Started

Create a file ckeditor.html with the following content: <!DOCTYPE html> <html> <head> <title>CKEditor Demo!</title> </head> <body> <script src="//cdn.ckeditor.com/4.6.1/basic/ckeditor.js"></script> <div id="e...

ckeditor • Getting started with ckeditor

Installation or Setup

Select the project you want to add the reference to Moq. Open Nuget for this project. Select "Browse" than type "moq" at the search box. Select "Moq" and than click on Install. Following these steps will install the Moq package and will add a reference to it i...

moq • Getting started with moq

Computing mean and variance

#include <iostream> #include <boost/accumulators/accumulators.hpp> #include <boost/accumulators/statistics/stats.hpp> #include <boost/accumulators/statistics/mean.hpp> #include <boost/accumulators/statistics/variance.hpp> int main() { using namespace boost...

boost • Boost Accumulators Framework

Installation or Setup

Detailed instructions on getting quickblox set up or installed. Go to https://admin.quickblox.com and click on “Register” at the top or just follow the link: https://admin.quickblox.com/register.

quickblox • Getting started with quickblox

Installation or Setup

Detailed instructions on getting oracle11g set up or installed.

oracle11g • Getting started with oracle11g

Self Join

A table can be joined onto itself in what is known as a self join, combining records in the table with other records in the same table. Self joins are typically used in queries where a hierarchy in the table's columns is defined. Consider the sample data in a table called Employees: IDNameBoss_ID1...

Microsoft SQL Server • Join

Generic Arrays

Generic arrays in Kotlin are represented by Array<T>. To create an empty array, use emptyArray<T>() factory function: val empty = emptyArray<String>() To create an array with given size and initial values, use the constructor: var strings = Array<String>(size = 5, init ...

Kotlin • Arrays

Arrays of Primitives

These types do not inherit from Array<T> to avoid boxing, however, they have the same attributes and methods. Kotlin typeFactory functionJVM typeBooleanArraybooleanArrayOf(true, false)boolean[]ByteArraybyteArrayOf(1, 2, 3)byte[]CharArraycharArrayOf('a', 'b', 'c')char[]DoubleArraydoubleArrayOf...

Kotlin • Arrays

Extensions

average() is defined for Byte, Int, Long, Short, Double, Float and always returns Double: val doubles = doubleArrayOf(1.5, 3.0) print(doubles.average()) // prints 2.25 val ints = intArrayOf(1, 4) println(ints.average()) // prints 2.5 component1(), component2(), ... component5() return an it...

Kotlin • Arrays

From borrowed to owned

// all variables `s` have the type `String` let s = "hi".to_string(); // Generic way to convert into `String`. This works // for all types that implement `Display`. let s = "hi".to_owned(); // Clearly states the intend of obtaining an owned obje...

Rust • Strings

Implementing Currying

One application of closures is to partially apply a function; that is, provide some arguments now and create a function that takes the remaining arguments. Currying is a specific form of partial application. Let's start with the simple function curry(f, x) that will provide the first argument to a ...

Julia Language • Closures

A simple proof

Theorem my_first_theorem : 1 + 1 = 2. Proof. reflexivity. Qed. Try it in your browser.

coq • Getting started with coq

Registering a stream wrapper

A stream wrapper provides a handler for one or more specific schemes. The example below shows a simple stream wrapper that sends PATCH HTTP requests when the stream is closed. // register the FooWrapper class as a wrapper for foo:// URLs. stream_wrapper_register("foo", FooWrapper::class...

PHP • Streams

Installation or Setup

Detailed instructions on getting rcpp set up or installed.

rcpp • Getting started with rcpp

Using an incremental index

This method works by incrementing an integer from 0 to the greatest index in the array. $colors = ['red', 'yellow', 'blue', 'green']; for ($i = 0; $i < count($colors); $i++) { echo 'I am the color ' . $colors[$i] . '<br>'; } This also allows iterating an array in reverse order wi...

PHP • Array iteration

Using internal array pointers

Each array instance contains an internal pointer. By manipulating this pointer, different elements of an array can be retrieved from the same call at different times. Using each Each call to each() returns the key and value of the current array element, and increments the internal array pointer. ...

PHP • Array iteration