Ruby is a dynamic, open-source programming language with a focus on simplicity and productivity. Created in the mid-1990s by Yukihiro "Matz" Matsumoto in Japan, it blends parts of other popular languages like Perl, Smalltalk, Eiffel, Ada, and Lisp, offering balanced functional and imperative programming. Ruby is object-oriented, meaning every value is an object, including classes and instances of types. It supports multiple programming paradigms, including procedural, object-oriented, and functional programming. Ruby's key principle is the concept of least surprise - the language should behave in a way that minimizes confusion for experienced users. Ruby is widely used for web development, thanks to the Ruby on Rails framework, which is a popular choice for building web applications. The Ruby community is known for its friendly and helpful nature, and there's a wealth of resources available for learning and improving your Ruby skills.

Features of Online Ruby Compiler

  • It can be accessed through any web browser
  • Easy to use interface and supports various libraries.
  • The syntax highlighting feature colours the elements of the code to increase readability.
  • Compiler’s Autocompletion feature accelerates coding by predicting already defined variables/functions and completing code.

Syntax Help

If-Else Statement:

In Ruby, the if-else statement is used to perform different actions based on different conditions. Here's the syntax:


# code to be executed if the condition is true
  # code to be executed if the condition is false


x = 10
if x > 5
 puts "x is greater than 5"
 puts "x is not greater than 5"

Switch Statement: 

In Ruby, instead of a traditional "switch" statement found in languages like C or Java, there's the "case" statement. This serves a similar purpose, allowing multiple conditions to be checked in a clean and efficient manner. Here's the syntax:


case expression
when expression1
 # code to be executed if expression matches expression1
when expression2
 # code to be executed if expression matches expression2
 # code to be executed if expression doesn't match any expressions


grade = 'B'
case grade
when 'A'
 puts "Excellent!"
when 'B'
 puts "Good job!"
when 'C'
 puts "You can do better!"
 puts "Invalid grade."

For Loop:

In Ruby, the for loop is used to repeatedly execute a block of code for a specific number of times. Here's the syntax:


for variable in expression
 # code to be executed


for i in 1..5
 puts "Value of i is #{i}"

While Loop:

In Ruby, the while loop is used to repeatedly execute a block of code as long as a certain condition is true. Here's the syntax:


while condition
 # code to be executed


count = 0
while count < 5
 puts "Count is #{count}"
 count += 1

Do-While Loop:

In Ruby, the language does not natively support a do-while loop like some other languages. However, you can achieve a similar effect using the begin-end structure combined with a while modifier. This kind of loop will execute the code block at least once, and then continue to execute it while a certain condition is true.


 # code to be executed
end while condition


count = 0
 puts "Count is #{count}"
 count += 1
end while count < 5

Functions in Ruby

How to declare Function

In Ruby, you can define a function (also known as a method) using the def keyword. Here's the syntax:

def method_name
 # code to be executed

How to call Function

In Ruby, once a method (or function) is defined, you can call (or invoke) it by using its name followed by parentheses. If the method requires arguments, you place them inside the parentheses.


In this syntax:

method_name is the name of the method you want to call.
arguments are any arguments you want to pass to the method. If you're passing multiple arguments, separate them with commas. If the method doesn't require any arguments, you can leave the parentheses empty.

How to define Function

In Ruby, you define a function (which is referred to as a method in Ruby) using the def keyword. The basic syntax is as follows:

def method_name(parameter1, parameter2, ...)
 # code to be executed

Working of the Online Ruby Compiler (IDE)

An online Ruby compiler, also known as an Integrated Development Environment (IDE), provides a platform where developers can write, compile, and execute Ruby code directly from their web browser. This tool is especially useful for beginners who are learning Ruby, as it eliminates the need for a local development setup and makes the learning process more streamlined.

The online Ruby compiler works in a few simple steps:

  • Code Writing: The user writes Ruby code in the text editor provided by the online compiler. This editor often supports syntax highlighting, which helps to identify syntax errors and makes the code more readable.
  • Code Compilation: Once the code is written, the user can compile the code by clicking on a "Run" or "Compile" button. The online Ruby compiler then interprets the Ruby code into a machine-readable format.
  • Code Execution: After successful compilation, the online compiler executes the code and displays the output in a console or output window.
  • Error Debugging: If there are any errors in the code, the compiler will display error messages in the console, helping the user to identify and fix issues in their code.
  • Code Sharing: Many online Ruby compilers also provide the feature to share the written code. This can be useful for code reviews, collaborative coding, or getting help from others.
  • Cross-Platform Compatibility: As the compiler runs in a web browser, it can be accessed from any device with internet access, including Windows, Mac, Linux machines, and even mobile devices.

The online Ruby compiler is a versatile tool, providing a convenient and accessible platform for Ruby programming. It can be used for learning Ruby, testing code snippets, solving coding problems, and even for small-scale development projects.

How to write and run the Ruby program online

To write and run a Ruby program online, you'll need to use an online Ruby compiler or IDE (Integrated Development Environment). 

Here's a step-by-step guide:

  • Find an Online Compiler: Search the internet for an "Online Ruby Compiler" or "Online Ruby IDE". Some popular options include, JDoodle, and Paiza.IO.
  • Open the Compiler: Open the online compiler in your web browser.
  • Write Your Code: Most online compilers will provide a text editor where you can write your Ruby code. The text editor may have features like syntax highlighting and line numbers to help you write your code.
  • Compile/Run Your Code: Once you've written your code, look for a button labeled "Run", "Compile", or something similar, and click it. This will tell the compiler to interpret your code.
  • View Your Output: After you've run your code, the output will be displayed in a console or output window. If there are any errors in your code, error messages will be displayed here.
  • Debug and Iterate: If your code didn't work as expected, you can make changes and then run it again. Repeat this process until you're satisfied with your program.
  • Save/Share Your Code: Many online compilers allow you to save your code to a file, or to share a link to your code with others. This can be useful for getting help with your code or for showing your work to others.

Remember, while an online compiler is great for learning and small projects, for larger projects you'll probably want to install Ruby on your local machine and use a more feature-rich IDE.

Benefits of using Online Ruby Compiler

  • Ease of Use: Online Ruby compilers are user-friendly and ideal for beginners. They provide a ready-to-use environment without the need for any setup or installation.
  • Cross-Platform: Online compilers are accessible from any device with an internet connection, including Windows, macOS, Linux, and even mobile devices.
  • Real-Time Compilation: Online compilers allow for real-time compilation and execution, which can be especially useful for debugging or learning programming concepts.
  • Code Sharing: Many online compilers provide options for code sharing. This is beneficial for collaborative projects, seeking help from others, or showcasing your work.
  • Updated Environment: Online compilers typically keep up with the latest version of Ruby, which allows users to experiment with new features without having to update their local development environment.
  • Resource Efficiency: Using an online compiler saves local computing resources, as the compilation and execution of code are done on the server-side.

Applications of Online Ruby Compiler

  • Learning and Education: Online Ruby compilers are excellent tools for learning and teaching Ruby. They provide a ready-to-use coding environment, making it easier for students to get started with programming.
  • Code Testing and Debugging: They provide a quick and easy way to test small pieces of Ruby code or to reproduce bugs, without the need to set up a complete development environment.
  • Interview Preparation: Online compilers can be used to practice coding problems commonly encountered in job interviews. They often come with a collection of practice problems that you can solve directly in the browser.
  • Collaborative Coding: Some online compilers allow multiple users to edit the same piece of code in real time, making them useful for pair programming or other collaborative coding tasks.
  • Code Sharing: You can use online compilers to share pieces of code with others. This can be useful for getting help with a problem, doing code reviews, or demonstrating a programming technique.
  • Cross-Platform Development: As they run in a web browser, online compilers can be used on any device with internet access. This makes them a good choice for developers who need to work on different operating systems.


  • Compiler: A compiler is an essential tool that can be used locally or online for compiling a code, that is, converting the code to a machine based language for output.
  • Interpreter: An Interpreter is a tool that works similarly to a compiler, converting high level code into machine based language, but it converts the code line by line rather than in a single pass.
  • Online IDE: Online IDE, or Integrated Development Environment, is a software based tool that is used as a single platform for all kinds of computer programming. It consists of an integrated compiler or interpreter, extensions, dependency files, and a debugger. Example: Eclipse
  • Code Editor: A Code Editor is another essential part of computer programming. It is a place where all source codes can be created and modified. It can be a stand alone application or part of an IDE. Example: Vim and Sublime
  • Coding Ground: Coding Ground is a tool that provides easy accessibility to developers for using more than one programming language, technology, and framework. It allows developers to use various tools on a single platform.


This online Ruby compiler is provided for educational and non-commercial use only. While Code 360 works diligently to make it accurate and user-friendly, we cannot guarantee error-free coding as challenges can occasionally arise with this tool. Code 360 is not responsible for any errors in the outcome based on the input by the user resulting from the use of this compiler.