Tutorial by Examples: re

Laravel 5 App on Shared Hosting on Linux Server

By default Laravel project's public folder exposes the content of the app which can be requested from anywhere by anyone, the rest of the app code is invisible or inaccessible to anyone without proper permissions. After developing the application on your development machine, it needs to be pushed t...

Laravel • Deploy Laravel 5 App on Shared Hosting on Linux Server

Let's use the controller a little more

Now we'll try going for a little more complex example, using the capabilities of the controller to fill in the view. Here is our view: /application/views/hello_world.php <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <titl...

codeigniter • Let's start: Hello World

Let's choose our greetings: Hello World or Good Bye World or ...?

Let's say that we want to have an alternative greeting that is accessible through a different URL. We might create a new function or even a new controller for that, but a best practice is to optimize what we already have, to make it work at it's best! To do this, we'll keep the same view as in the ...

codeigniter • Let's start: Hello World

Recursively describe an object structure

Recursion is when a method calls itself. Preferably it will do so until a specific condition is met and then it will exit the method normally, returning to the point from which the method was called. If not, a stack overflow exception might occur due to too many recursive calls. /// <summary>...

C# Language • Recursion

Read All Contents of a File

To read the contents to a file into a string variable: Dim fileContents As String = System.IO.File.ReadAllText("filename.txt") ReadAllText will open the specified file, read data to the end, then close the file. To read a file, separating it into an array element for each line: Dim f...

Visual Basic .NET Language • File Handling

Create PDF

UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil); UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil); [self drawText]; UIGraphicsEndPDFContext(); fileName is the document file where You are going to append or attach NSString* temporaryFile = @"firstI...

iOS • PDF Creation in iOS

Gotcha: Exception in Dispose method masking other errors in Using blocks

Consider the following block of code. try { using (var disposable = new MyDisposable()) { throw new Exception("Couldn't perform operation."); } } catch (Exception ex) { Console.WriteLine(ex.Message); } class MyDisposable : IDisposable { public vo...

C# Language • Using Statement

call/N predicates

The call/N family of predicates can call arbitrary Prolog goals at run time: ?- G=true, call(G). true. ?- G=(true,false), call(G). false.

Prolog Language • Higher-Order Programming

Recording audio from a microphone source

In order to record audio from a user's microphone, we must first gain permission from the user to access the device: navigator.mediaDevices.getUserMedia({ audio: true }) .then(successCallback) .catch(failureCallback); On success, our successCallback will be called with a MediaStream ob...

web-audio • Getting started with web-audio

!/0 and related predicates

Predicates that impede or prohibit a declarative reading of Prolog programs are extra-logical. Examples of such predicates are: !/0 (->)/2 and if-then-else (\+)/1 These predicates can only be understood procedurally, by taking into account the actual control flow of the interpreter, and a...

Prolog Language • Extra-logical Predicates

Accessing PostgreSQL with the C-API

The C-API is the most powerful way to access PostgreSQL and it is surprisingly comfortable. Compilation and linking During compilation, you have to add the PostgreSQL include directory, which can be found with pg_config --includedir, to the include path. You must link with the PostgreSQL client s...

postgresql • Accessing Data Programmatically

Main Differences

Although people often say Sass as the name of this CSS-preprocessor, they often mean the SCSS-syntax. Sass uses the .sass file extension, while SCSS-Sass uses the .scss extension. They are both referred to as "Sass". Speaking generally, the SCSS-syntax is more commonly used. SCSS looks li...

sass • SCSS vs Sass

Table creation with Primary Key

CREATE TABLE person ( person_id BIGINT NOT NULL, last_name VARCHAR(255) NOT NULL, first_name VARCHAR(255), address VARCHAR(255), city VARCHAR(255), PRIMARY KEY (person_id) ); Alternatively, you can place the PRIMARY KEY constraint directly in the column definition: ...

postgresql • Table Creation

Loading an image from a resource

To load a bundled image: package com.example; public class ExampleApplication { private Image getIcon() throws IOException { URL imageURL = ExampleApplication.class.getResource("icon.png"); return ImageIO.read(imageURL); } }

Java Language • Resources (on classpath)

REVERSE

Syntax is: REVERSE ( string-expression ) SELECT REVERSE('Hello') --returns olleH

SQL • String Functions

Reactively re-subscribing to a publication

A template autorun may be used to (re)subscribe to a publication. It establishes a reactive context which is re-executed whenever any reactive data it depends on changes. In addition, an autorun always runs once (the first time it is executed). Template autoruns are normally put in an onCreated met...

meteor • Publishing Data

Create a new Function

CREATE FUNCTION FirstWord (@input varchar(1000)) RETURNS varchar(1000) AS BEGIN DECLARE @output varchar(1000) SET @output = SUBSTRING(@input, 0, CASE CHARINDEX(' ', @input) WHEN 0 THEN LEN(@input) + 1 ELSE CHARINDEX(' ', @input) END) RETURN @output END ...

SQL • CREATE FUNCTION

Find a man page in a different section

Sometimes a term is defined in multiple sections of the manual. By default, man will only display the first page it finds, which can be annoying for programmers because C functions are documented in a later section than commands and system calls. Use the following to display all pages that match a...

unix • View the Manual Pages

Creating Minification-Safe Angular Controllers

To create minification-safe angular controllers, you will change the controller function parameters. The second argument in the module.controller function should be passed an array, where the last parameter is the controller function, and every parameter before that is the name of each injected val...

AngularJS • Controllers

Ignore files locally without committing ignore rules

.gitignore ignores files locally, but it is intended to be committed to the repository and shared with other contributors and users. You can set a global .gitignore, but then all your repositories would share those settings. If you want to ignore certain files in a repository locally and not make t...

Git • Ignoring Files and Folders