Tutorial by Examples: g

A model (see: Model-View-Controller pattern) in Grails is represented by a so-called Domain Class. Domain classes can define both the persistence and presentation of information in grails. Domain classes can also contain validations. To manage a fleet of cars in your Grails application you could de...

Create a console application. Install EntityFramework nuget package by running Install-Package EntityFramework in "Package Manager Console" Add your connection string in app.config file , It's important to include providerName="System.Data.SqlClient" in your connection. Cre...

If you have a multidimensional array like this: [ ['foo', 'bar'], ['fizz', 'buzz'], ] And you want to change it to an associative array like this: [ 'foo' => 'bar', 'fizz' => 'buzz', ] You can use this code: $multidimensionalArray = [ ['foo', 'bar'], ...

The command syntax will be of the following type: <REST Verb> /<Index>/<Type>/<ID> Execute the following command to explore elasticsearch cluster through Kibana Console. For checking the cluster health GET /_cat/health?v For listing all the indices GET /_cat...

In the beginning there were callbacks, and callbacks were ok: const getTemperature = (callback) => { http.get('www.temperature.com/current', (res) => { callback(res.data.temperature) }) } const getAirPollution = (callback) => { http.get('www.pollution.com/current', (res) ...

Command-line options for applications are not treated any differently from command-line arguments by the C language. They are just arguments which, in a Linux or Unix environment, traditionally begin with a dash (-). With glibc in a Linux or Unix environment you can use the getopt tools to easily d...

As the header already says, the following list contains "interoperable signature types" which are more or less strictly defined. The PDF specification specifies a way to also include completely custom signing schemes. But let us assume we are in an interoperable situation. The the collecti...

It is possible to specify a text hint when using EditTexts. Text hints are useful for conveying to the user what they should type in the EditText. In XML: <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="use...

In case of big data sets, the call of grepl("fox", test_sentences) does not perform well. Big data sets are e.g. crawled websites or million of Tweets, etc. The first acceleration is the usage of the perl = TRUE option. Even faster is the option fixed = TRUE. A complete example would be: ...

This example shows how to make an interactive presentation transition with "real-world" physics similar to iOS's notifications screen. To start with, we need a presenting view controller that the shade will appear over. This view controller will also act as our UIViewControllerTransitio...

Processing provides method triangle() to draw a triangle. This code draws a white triangle on black background. void setup() { size(500, 500); background(0); fill(255); noStroke(); } void draw() { triangle(250, 225, 225, 275, 275, 275); }

Another convenient solution for cross compilation is the usage of gox: https://github.com/mitchellh/gox Installation The installation is done very easily by executing go get github.com/mitchellh/gox. The resulting executable gets placed at Go's binary directory, e.g. /golang/bin or ~/golang/bin. E...

In order to load data from a MongoDB database into an R dataframe, use the library MongoLite: # Use MongoLite library: #install.packages("mongolite") library(jsonlite) library(mongolite) # Connect to the database and the desired collection as root: db <- mongo(collection = &quo...

Methods used: .DriveExists(strDrive) returns (True/False) .FileExists(strFile) returns (True/False) .FolderExists(strFolder) returns (True/False) The following code checks for the existence of a file using the "FileExists" method of a file system object. For checking the existence of...

Methods used: .DeleteFolder(FileSpec, Force (True/False)) .CreateFolder(Path) .DeleteFile(FileSpec, Force (True/False)) The following example illustrates the Deletion and creation of a folder using the methods "DeleteFolder" and "CreateFolder". Code: Dim strFolderPath, ob...

Methods Used: .CopyFile(Source, Dest [,Overwrite (True/False)] .CopyFolder(Source, Dest [,Overwrite (True/False)] The following code illustrates the use of CopyFile method to copy a file to a new location. The same thing can be achieved for the folders by using the CopyFolder method. Code: Di...

Methods Used: .MoveFile(Source, Dest) .MoveFolder(Source, Dest) The following code illustrates the use of MoveFile method to Move a file to a new location. The same thing can be achieved for the folders by using the MoveFolder method. Code: Dim objFso, strSourcePath, strDestPath strSourcePat...

As you would know, Hadoop can be run in the local environment in 3 different modes : Local Mode Pseudo Distributed Mode Fully Distributed Mode (Cluster) Typically you will be running your local hadoop setup in Pseudo Distributed Mode to leverage HDFS and Map Reduce(MR). However you cannot de...

This example shows how to customize the UIDynamicItem protocol to map position changes of a view being dynamically animated to bounds changes to create a UIButton that expands and contracts in a elastic fashion. To start we need to create a new protocol that implements UIDynamicItem but that also...

Redis-py provides the execute_command method to directly invoke Redis operations. This functionality can be used to access any modules that may not have a supported interface in the redis-py client. For example, you can use the execute_command to list all of the modules loaded into a Redis server:...