Ruby Course – Worldwideasy – 04

Ruby lesson 4. I will focus on Getting Control Statements (IF statement, Case Expressions, loops), Comments, and File Control. It can provide extensive knowledge.

Control Statements

A control statement is a statement that determines whether other statements are active. If a statement decides whether another statement should be executed, or one of the two statements to be executed. A loop determines the number of times another expression should be executed.

Basically have 3 control statement

  • IF
  • Switch
  • Loops

IF Statement in Ruby

If a statement is used to check the condition, it can be a condition or more. The special feature of it is that you can check any gap. The following example will make it clear to you.

ismale = false 
if ismale
   puts "you are male"
   puts "you are not male"

This Code output is you are not male.

Case Expressions

The Case Expressions is used to check several non-gap conditions. This works very fast and gets the idea below

def get_day_name(day)
day_name=" "

case day
when "mon"
day_name = "Monday"
when "tue"
day_name = "Tuesday"
when "wed"
day_name = "Wednesday"
when "tur"
day_name = "Thursday"
when "fri"
day_name = "Friday"
when "sat"
day_name = "Saturday"
when "sun"
day_name = "Sunday"
day_name = "Invalid"
return day_name
puts get_day_name("wed")

This code output is Wednesday.


Loops have main 3 loops in php

  • For loop
  • While loop

Now I show the First 3 loops using Code. See Below all code output is the same. output is : 1,2,3,4,5,6,7,8,9,10.

For Loop with Arry

num = [1,2,3,4,5,6,7,8,9,10]
for num in num 
puts num

While Loop

index = 1
while index < 8
puts index 
index + = 1

Ruby Comment

Comments are a special character in programming.

# single line comment
= multiline
  comment =

File Control using Ruby

Here we show you how to handle files without opening them. see below

Reading File"test.txt",r) do |tile|
Write File"employee.txt","a") do |file|
file.write ("sanka")
Create File ("index.html","w") do |file|
Read and Write ("employee.txt","rt") do |file|
file.write ("overridden")

Class & Object

Class is collection of objects and functions. In computer programming, a function object is a construct that allows an object with the same syntax to be called or called a normal function. Active objects are often referred to as funksters.

This is the mining of the object and class. now we can try to add it ruby. look below example.

class Book
attr_accessor :title, :author, :pages

book1 =
book1.title = "Harry Potter"
book1.auther = "JK"
book1.pages = 400
puts book1.pages

Output is 4000.


See the below example. that use code reuses it easy for developing softwares.

attr_accessor:name, :major, :gpa
def initialize (name,major,gpa)
@ name = name
@ major = major
@ gpa = gpa
student1 = ("harry","bio","3.6")
student2 = ("jhone","chem","2.1")

Output is harried.

Create a Ruby 2D Game

First, install ruby 2d gem. open cmd

gem install ruby2d

Click Here to get the Source code.

you can see the below output in-game.

Now over the Ruby basic course. you go to this link and answer the question and get a Ruby certificate. Get Certificate

Thank you for all!

More Ruby ClickHere!

See you Next Lesson Soon!

Ruby Course – Worldwideasy – 03

Ruby Programming lesson 3. Today we going to learn more about it. Today I will focus on Getting User Input, Hashes, Method and If Statement. Finally, Create a simple Calculator. It can provide extensive knowledge.

Getting User Input in Ruby Programming

Uses any computer language user input is how Ruby does it. But it happens here in a very different way. We are focusing on that step by step.

First, you need to install Platformio-ide-terminal on Atom text editor.

  1. Go Settings
  2. >> install
  3. Search “Platformio-ide-terminal”
  4. Install it
  5. Search “Ruby Ide” and install it

The code below explains it to you.

puts "Enter Name "
name = gets
puts ("hello" + name)

Run using CMD this code output is hello with your entered name. see below another example

puts "Enter Your Name: "
name = gets.chomp()
puts "Enter Your Age: "
age = gets.chomp()
puts ("hello" + name + "you are " +age)

Hashes in Ruby Programming

A hash function is any function that can be used to map data of arbitrary size to fixed-size values. The values ​​given by a hash function are called hash values, hash codes, digests, or simply hashes. Values ​​are used to index a fixed-size table called a hash table.

Hashes are used to shorten a word or line of words and make it very easy to code. The following example illustrates this for you.

New York >> NY
Sri Lanka >> SL
Hello World >> HW 

As mentioned above, those words are short but the output is long.


Object-oriented programming is a method of action related to a message and an object. An object consists of data and behaviors; These have an interface that specifies how the object can be used by its various customers.

You have an understanding of the method Now let us see how to use this for ruby

def sayhi
  puts "Hello user"

puts 'top'
puts 'bottom'

see below code output


Another example

def sayhi (name)
  puts ("Hi " + name)

sayhi ("harry")

This Code Output is Hi harry

Create Calculator Using Ruby

We create a very good Calculator based on the knowledge we have learned about ruby ​​so far. Here you also have to learn about if

puts "Enter First Number : "
num1 = gets.chomp().to_f
puts "Enter Opartor : "
op = gets.chomp()
puts "Second Number : "
num2 = gets.chomp().to_f

if op == '+'
  puts (num1 + num2)
else if op == "-"
  puts (num1 - num2)
else if op == "*"
  puts (num1 * num2)
else if op == "/"
  puts (num1 / num2)
  puts "invalid Enter"

Here you can input two numbers as output and select an operator and perform some action

Thank you for all!

More Ruby ClickHere!

See you Next Ruby Lesson Soon!

Ruby Course – Worldwideasy – 02

Ruby programming lesson 2. Today we going to learn more about Ruby. In this tutorial, we will focus on variables, Strings, Numbers, and Operations. It can provide extensive knowledge.

Use Variable

Variables are used to store information to be referenced and manipulated in a computer program. They also provide a way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves. It is helpful to think of variables as containers that hold information. Their sole purpose is to label and store data in memory. This data can then be used throughout your program.

Now you know what is variable, let’s use it Ruby Programming

character_name = "jenny"
character_age = "23"
puts "my name is "+ character_name
puts "my age is "+ character_age

This Code output is My Name is jenny my age is 23. you can try this code in your pc.

Working with Strings Ruby Programming

Threads are traditionally alphabetical. Now you can see how it works. see the below table and get an idea about ruby strings.

Phone = "Apple Iphone"
puts Phone.upcaseAPPLE IPHONE
puts Phone.downcaseApple iPhone
puts Phone.stripApple iPhone
puts Phone.length12
puts Phone.include?"Apple"true
puts Phone.include?"cake"false
puts Phone.[3,5]le Ip
puts "hp".upcase()HP

Work with Strings

Working With Numbers

Every computer language uses numbers in particular. This is because it allows you to easily control the data. let me show you how to work with numbers in Ruby.

puts -5.43215-5.43215
puts 5+914
puts 5/90
puts 2*36
puts 2**38
puts 10%31
puts 5-23

Operations & Math in Ruby Programming

In mathematics, we use different operations, i.e. maximum value, square root, fall. They are also used differently in programming. The following example will give you a broader understanding.

num = 30.67
puts num.abs()30.67
puts num.round()30
puts num.ceil()31
puts num.floor()30



it is a hard mathematics part but using ruby we can do it easily. see below table.

puts Math.sqrt (2)1.4142135623730951
puts Math.log (2)0.6931471805599453


Now you have developed some knowledge about Ruby. Try typing this code on your computer as well. Practice

Thank you for all!

More Ruby ClickHere!

See you Next Ruby Lesson Soon!

Ruby Course – Worldwideasy – 01

Ruby programing is a defined, high-level, general-purpose programming language. It was designed and developed by Yukihiro “Mats” Matsumoto of Japan in the mid-1990s. is dynamically typed and uses garbage collection.

Ruby programming is a high-level programming language. The implementation language here is c. This was created in 1995 by Yukihiro Matsumoto. The file extension here is .rb. Editors used for this are Atom, Komodo IDE, and RubyMine. This language is a language that can do all the work of web design & software development. Let us now learn about this step by step.

How to install Ruby in your pc!(Windows).

  1. First Download & Install Atom Editor.
  2. Open Atom.exe
  3. Find head bar >> Packages >> Settings View >> Install Package.
  4. Now search bar search “Atom-runner.
  5. And install this package close Atom.
  6. Download Ruby Pack.
  7. Install base install.
  8. Check installation
    1. open cmd
    2. type ruby -v
    3. you can see ruby version.

Ruby Frameworks

What is the framework? This is software. This helps to make the website easier. It has more options to easily develop any program. has web services, web resources, and web APIs. It helps us to develop a good website. But to work with Ruby Framework you need to have a basic knowledge of Ruby. See below its top 10 frames in 2020.

  1. Ruby on Rails
  2. Sinatra
  3. Padrino
  4. Hanami
  5. NYNY
  6. Scorched
  7. Hobbit
  8. Cuba
  9. Crepe
  10. Nancy

I recommend developing using Ruby on Rails and Sinatra is good. I put a link below you can go its site,

How to Make First Ruby File

Hello World

  • First Open Atom Editor.
  • This language is similar to Python and R. No blocks.
  • Ruby have 2 main text output method it is puts or print you can use both of them.
  • Special Ruby code line end not use semicolon ( ; ).
  • See below full code of hello world in Ruby,
print "Hello "
puts "World"
  • Save now (ctrl + s)
  • Run code (alt + r)
  • You can see below output Hello World.

Thank you for all!

More Ruby ClickHere!

See you Next Ruby Lesson Soon!