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How to convert from Go to Ruby

If you're looking to switch from Go to Ruby in your development projects, you're in the right place. Here, we'll walk you through the key differences and provide actionable insights on how to convert your Go code to Ruby effectively.

Understanding the Fundamental Differences

First off, it's crucial to understand the fundamental differences between Go and Ruby. Go, a statically typed and compiled language, leans towards simplicity and performance. Ruby, on the other hand, is an interpreted language known for its flexibility and elegance. They cater to different paradigms and programming styles, so let’s dissect their core differences.

Data Types and Variables

Go: Static Typing and Explicit Declarations

In Go, variables are statically typed and require explicit declarations. For example:

var age int = 30

You can also use shorthand syntax:

age := 30

Ruby: Dynamic Typing and Implicit Declarations

Ruby uses dynamic typing, where variable types are determined at runtime. Here’s the equivalent Ruby code:

age = 30

Control Structures

Go: Defined Structure with Braces

Go uses braces {} to define code blocks with control structures like if, for, switch:

if age > 18 {

Ruby: Flexible Syntax with End Keywords

Ruby simplifies control structures with end keywords:

if age > 18
  puts "Adult"

Functions and Methods

Go: Function Syntax with Explicit Returns

In Go, you define functions with explicit parameter and return types:

func greet(name string) string {
    return "Hello " + name

Ruby: Methods with Implicit Returns

Ruby methods don’t require explicit return types and often don’t need the return keyword:

def greet(name)
  "Hello " + name


Go: Goroutines and Channels

Go is famous for its built-in concurrency using goroutines and channels:

go func() {
    fmt.Println("Hello from a goroutine")

Ruby: Threads and Gems

Ruby handles concurrency with threads and third-party libraries (gems) like Concurrent-Ruby:

thread = Thread.new do
  puts "Hello from a thread"

Error Handling

Go: Multiple Return Values

Go returns multiple values for error handling, which is a unique feature:

file, err := os.Open("filename")
if err != nil {

Ruby: Exception Handling

Ruby uses exception handling with begin-rescue blocks:

  file = File.open("filename")
rescue => e
  puts e.message

Converting Common Go Constructs to Ruby

To help you get started with conversion, here are a few common Go constructs and their Ruby equivalents.

Go Struct to Ruby Class


type Person struct {
    Name string
    Age  int


class Person
  attr_accessor :name, :age

Go Interface to Ruby Module


type Animal interface {
    Speak() string


module Animal
  def speak
    # implementation

Practical Example: Converting a Go Program to a Ruby Program

Consider a simple Go program that prints a greeting:

package main

import "fmt"

func greet(name string) string {
    return "Hello " + name

func main() {

Here's how you can convert this to a Ruby program:

def greet(name)
  "Hello " + name

puts greet("World")

Tools to Assist in the Conversion Process

While there aren't many automated converters that can handle the intricacies of converting Go to Ruby due to their differences in paradigms, understanding these fundamental concepts will help you structure your code efficiently. You can also use IDEs and text editors with language support to ease the transition.

Code Linters

Code linters and formatters in both languages can help you maintain consistency while converting:

  • Go: gofmt, golint
  • Ruby: rubocop

Debugging Tools

Utilize debugging tools to test your new Ruby code systematically:

  • Go: delve
  • Ruby: byebug


Transitioning from Go to Ruby involves a shift in paradigms, given their distinct characteristics. By understanding these fundamental differences and using the provided examples, you can streamline the conversion process. With practice, you'll become proficient in writing elegant and efficient Ruby code.

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