Wednesday, September 20, 2017

Scala Tutorial 4 - Data Types and Variables



Strong typing is very important in functional programming

Most scripting like Ruby, Python, etc. are dynamically typed, which is supposed to be one of their advantages.

Static typing makes programming much safer.

But sometimes types declarations become a burden.

Scala’s type inferencing mechanism minimizes the number of type declarations required.

It’s not uncommon for user code to have no explicit types.



Data Types Byte : 8 bit signed value. Range from -128 to 127

Short : 16 bit signed value. Range -32768 to 32767 Int : 32 bit signed value. Range -2147483648 to 2147483647

Long : 64 bit signed value. -9223372036854775808 to 9223372036854775807

Float : 32 bit IEEE 754 single-precision float

Double : 64 bit IEEE 754 double-precision float Char : 16 bit signed Unicode character. Range from U+0000 to U+FFFF

String : A sequence of Chars

Boolean : Either the literal true or the literal false Unit: Corresponds to no value : void

Null: null or empty reference

Nothing : The subtype of every other type; includes no values Any: The supertype of any type; any object is of type

Any : Java's Object class

AnyRef: The supertype of any reference type





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Saturday, September 16, 2017

Scala Tutorial 3 - How to Install and Setup SBT on Windows 10





SBT (Scala Build Tool, formerly Simple Build Tool) is an open source build tool for Scala and Java projects, similar to Java's Maven and Ant. In this video I am going to show you How to Install and Setup SBT on Windows 10. Also i am going to show you How to execute sbt on Windows to open the interactive shell?



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Scala Tutorial 2 - Introduction to SBT (Scala Build Tool)



SBT (Scala Build Tool, formerly Simple Build Tool) is an open source build tool for Scala and Java projects, similar to Java's Maven and Ant. SBT is a modern build tool. While it is written in Scala and provides many Scala conveniences, it is a general purpose build tool. sbt is the de facto build tool in the Scala.
Why SBT :
- Native support for compiling Scala code.
- Uses Apache Ivy for dependency management
- Only-update-on-request model
- Full Scala language support for creating tasks
- Support for mixed Java/Scala projects
- Launch REPL (Read–Eval–Print Loop) in project context.

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Saturday, September 9, 2017

Scala Tutorial 1 - Introduction to Scala





- “Scala is an acronym for Scalable Language ”
- Scala is a modern multi-paradigm programming language designed to express common programming patterns in a concise, elegant, and type-safe way.
- Scala is written by Martin Odersky at EPFL.
- Scala is Statically Typed
- Scala Runs on JVM, full inter-op with Java.
- Scala is Object Oriented
- Scala is Functional
- Scala has Dynamic Features
- Scala is Scala blends object-oriented and functional programming in a statically typed language.

Tuesday, September 5, 2017

Redis Tutorial for Beginners 11 - Redis Publish Subscribe





SUBSCRIBE, UNSUBSCRIBE and PUBLISH implement the Publish/Subscribe messaging paradigm where senders (publishers) are not programmed to send their messages to specific receivers (subscribers).
PSUBSCRIBE pattern [pattern ...]
Listen for messages published to channels matching the given patterns
PUBSUB subcommand [argument [argument ...]]
Inspect the state of the Pub/Sub subsystem
PUBLISH channel message
Post a message to a channel
PUNSUBSCRIBE [pattern [pattern ...]]
Stop listening for messages posted to channels matching the given patterns
SUBSCRIBE channel [channel ...]
Listen for messages published to the given channels
UNSUBSCRIBE [channel [channel ...]]
Stop listening for messages posted to the given channels

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Saturday, September 2, 2017

What Is JSON ?



“JSON” stands for “JavaScript Object Notation”
Despite the name, JSON is a (mostly) language-independent way of specifying objects as name-value pairs. Json Commonly used in Web as a vehicle to describe data being sent between systems. JSON or JavaScript Object Notation is a lightweight text-based open standard designed for human-readable data interchange.


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Thursday, August 31, 2017

How to Install Eclipse Oxygen on Ubuntu 16.04





In this video I am going to show you How to Install The Latest Eclipse in Ubuntu 16.04.

Download Website
https://www.eclipse.org

Java Install command
sudo apt-get install openjdk-8-jdk

What’s Eclipse?
- Eclipse is An IDE is an Integrated Development Environment
- It is a free software / open source platform-independent software framework for delivering what the project calls "rich-client applications". Eclipse is also a community of users, constantly extending the covered application areas.
- Eclipse was originally developed by IBM as the successor of its VisualAge family of tools.
- Eclipse is now managed by the Eclipse Foundation, an independent not-for-profit consortium of software industry vendors.

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Tuesday, August 8, 2017

How To Install MySQL on Mac OS X











In this post we will learn how to How To Install MySQL on Mac OS X. The same procedure can be used for installing MySQL on Mac OS X.

How to add MySQL to $PATH variable:
cd to your home folder
$ open -t .bash_profile
Try adding the following line to your .bash_profile file.
export PATH=${PATH}:/usr/local/mysql/bin/

Setting the MySQL root user password on OS X
$ mysql -u root -p
mysql$ ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass'; 

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Sunday, July 30, 2017

How to Install Apache Tomcat on Mac OS X







Tomcat is a Servlet container (Web server that interacts with Servlets) developed under the Jakarta Project of Apache Software Foundation.

Tomcat implements the Servlet and the Java Server Pages (JSP) specifications of Sun Microsystems

Tomcat is an open-source, non commercial project

Licensed under the Apache Software License

Tomcat is written in Java (OS independent)



Download and unzip the tar.gz:

http://tomcat.apache.org/download-70.cgi



install:



sudo mkdir /usr/local

sudo mv ~/Downloads/apache-tomcat-7.0.*  /usr/local

sudo ln -s /usr/local/apache-tomcat-7.0.*  /Library/Tomcat

sudo chown -R your-OSX-username  /Library/Tomcat

sudo chmod +x /Library/Tomcat/apache-tomcat-7.0.*/bin/*.sh



start:

/Library/Tomcat/bin/startup.sh



stop:

/Library/Tomcat/bin/shutdown.sh





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Wednesday, July 26, 2017

Shell Scripting Tutorial





For more detailed Tutorial visit - https://goo.gl/bbvi0C



A shell script is a computer program designed to be run by the Unix shell, a command-line interpreter. The various dialects of shell scripts are considered to be scripting languages. A shell usually interprets a single line of input, but we can also create a file containing a number of lines of commands to be interpreted. This file is a program known as a shell script. The program can also contain control structures (if-then, loops). Shell scripts allow a sequence of commands to be executed automatically . Shell Scripting tutorial is designed to help beginners and professionals.



00:00:00 1 - Introduction

00:10:00 2 - using Variables and Comments

00:20:11 3 - Read User Input

00:31:37 4 - Pass Arguments to a Bash-Script

00:40:08 5 - If Statement ( If then , If then else, If elif else)

00:53:20 6 - File test operators

01:03:45 7 - How to append output to the end of text file

01:14:26 8 - Logical 'AND' Operator

01:21:01 9 - Logical 'OR' Operator

01:26:35 10 - Perform arithmetic operations

01:33:51 11 - Floating point math operations in bash | bc Command

01:46:06 12 - The case statement

01:53:53 13 - The case statement Example

02:02:26 14 - Array variables

02:12:51 15 - WHILE Loops

02:19:07 16 - using sleep and open terminal with WHILE Loops

02:23:59 17 - Read a file content in Bash

02:31:15 18 - UNTIL loop

02:35:38 19 - FOR loop

02:44:08 20 - use FOR loop to execute commands

02:50:44 21 - Select loop

02:57:41 22 - Break and continue

03:04:11 23 - Functions

03:13:48 24 - Local variables

03:22:09 25 - Function Example

03:34:16 26 - Readonly command

03:41:34 27 - Signals and Traps

04:03:08 28 - How to debug a bash script



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