Tutorial by Examples: l

Basic Template

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-widt...

twitter-bootstrap • Getting started with twitter-bootstrap

You can create a new hash with the keys or values modified, indeed you can also add or delete keys, using inject (AKA, reduce). For example to produce a hash with stringified keys and upper case values: fruit = { name: 'apple', color: 'green', shape: 'round' } # => {:name=>"apple",...

Ruby Language • Hashes

Hello World

There are two things you will need to know when writing a "hello world" application in Erlang: The source code is written in the erlang programming language using the text editor of your choice The application is then executed in the erlang virtual machine. In this example we will inte...

Erlang Language • Getting started with Erlang Language

Simple data structures

Structure data types are useful way to package related data and have them behave like a single variable. Declaring a simple struct that holds two int members: struct point { int x; int y; }; x and y are called the members (or fields) of point struct. Defining and using structs: ...

C Language • Structs

Upper & lower case

SELECT UPPER('HelloWorld') --returns 'HELLOWORLD' SELECT LOWER('HelloWorld') --returns 'helloworld'

SQL • String Functions

Split

Splits a string expression using a character separator. Note that STRING_SPLIT() is a table-valued function. SELECT value FROM STRING_SPLIT('Lorem ipsum dolor sit amet.', ' '); Result: value ----- Lorem ipsum dolor sit amet.

SQL • String Functions

Length

SQL Server The LEN doesn't count the trailing space. SELECT LEN('Hello') -- returns 5 SELECT LEN('Hello '); -- returns 5 The DATALENGTH counts the trailing space. SELECT DATALENGTH('Hello') -- returns 5 SELECT DATALENGTH('Hello '); -- returns 6 It should be noted though, that DATALE...

SQL • String Functions

Installation and setup

Nginx is a Web server used to serve HTTP requests over the Internet. Nginx is available on Linux, Windows and other OSes as direct download, and can also be built from source. For detailed instructions see Nginx official reference. ubuntu/debian nginx stable version is available in official repo,...

nginx • Getting started with nginx

Installation or Setup

Detailed instructions on getting azureservicebus set up or installed.

azureservicebus • Getting started with azureservicebus

Creating an Option value and pattern match

// The Option type can either contain Some value or None. fn find(value: i32, slice: &[i32]) -> Option<usize> { for (index, &element) in slice.iter().enumerate() { if element == value { // Return a value (wrapped in Some). return Some(index);...

Rust • Option

Minimal example

To write the traditional Hello World program in Rust, create a text file called hello.rs containing the following source code: fn main() { println!("Hello World!"); } This defines a new function called main, which takes no parameters and returns no data. This is where your progra...

Rust • Getting started with Rust

Enum-style unions

Type information does not need to be included in the cases of a discriminated union. By omitting type information you can create a union that simply represents a set of choices, similar to an enum. // This union can represent any one day of the week but none of // them are tied to a specific unde...

F# • Discriminated Unions

Applying a function to each element of an array

To apply a function to every item in an array, use array_map(). This will return a new array. $array = array(1,2,3,4,5); //each array item is iterated over and gets stored in the function parameter. $newArray = array_map(function($item) { return $item + 1; }, $array); $newArray now is a...

PHP • Executing Upon an Array

Accessing elements

You can access the elements of an array by their indices. Array index numbering starts at 0. %w(a b c)[0] # => 'a' %w(a b c)[1] # => 'b' You can crop an array using range %w(a b c d)[1..2] # => ['b', 'c'] (indices from 1 to 2, including the 2) %w(a b c d)[1...2] # => ['b'] (indic...

Ruby Language • Arrays

Allocating Memory

Standard Allocation The C dynamic memory allocation functions are defined in the <stdlib.h> header. If one wishes to allocate memory space for an object dynamically, the following code can be used: int *p = malloc(10 * sizeof *p); if (p == NULL) { perror("malloc() failed");...

C Language • Memory management

Logging fatal errors

In PHP, a fatal error is a kind of error that cannot be caught, that is, after experiencing a fatal error a program does not resume. However, to log this error or somehow handle the crash you can use register_shutdown_function to register shutdown handler. function fatalErrorHandler() { // Let...

PHP • Exception Handling and Error Reporting

Default values for instance variables

If the variable contains a value of an immutable type (e.g. a string) then it is okay to assign a default value like this class Rectangle(object): def __init__(self, width, height, color='blue'): self.width = width self.height = height self.color = color d...

Python Language • Classes

Tuples

A tuple is a fixed length ordered sequence of other Erlang terms. Each element in the tuple can be any type of term (any data type). 1> {1, 2, 3}. {1,2,3} 2> {one, two, three}. {one,two,three} 3> {mix, atom, 123, {<<1,2>>, [list]}}. {mix,atom,123,{<<1,2>>,[list...

Erlang Language • Data Types

Installation or Setup

XSLT is a special-purpose programming language; it is widely used for transforming XML documents either into a different XML format, into HTML, or into text-based formats. There are two main versions of XSLT in use: XSLT 1.0 and XSLT 2.0. XSLT 1.0 is more widely implemented but has many restriction...

xslt • Getting started with xslt

The migration files

Migrations in a Laravel 5 application live in the database/migrations directory. Their filenames conform to a particular format: <year>_<month>_<day>_<hour><minute><second>_<name>.php One migration file should represent a schema update to solve a particu...

Laravel • Database Migrations