Everything is an object mental model in Ruby

Introduction

In Ruby, everything is treated as an object. This means all data and actions are objects, making the language simple and consistent.

When you want to understand how Ruby handles data and methods uniformly.

When you need to call methods on numbers, strings, or even true/false values.

When you want to create your own objects and use Ruby's object features.

When debugging or exploring how Ruby stores and processes information.

When learning how to use Ruby's built-in methods on any value.

Syntax

Ruby

# Example showing different objects
5.class       # => Integer
"hi".class   # => String
true.class    # => TrueClass
nil.class     # => NilClass

Every value you use in Ruby is an object with its own class.

You can call methods on any object, even numbers and true/false.

Examples

Calling methods on different objects: number, string, and boolean.

Ruby

5.to_s
"hello".upcase
true.to_s

Using methods to check or get information from objects.

Ruby

nil.nil?
123.even?
"abc".length

Sample Program

This program shows that numbers, strings, booleans, and nil are all objects. It also calls methods on them.

Ruby

puts 10.class
puts "Ruby".class
puts false.class
puts nil.class

puts 10.to_s
puts "Ruby".upcase
puts false.to_s

Important Notes

Remember, even simple things like numbers are objects in Ruby.

This makes Ruby very consistent and easy to learn.

Summary

Everything in Ruby is an object, including numbers, strings, and booleans.

You can call methods on any object, which makes Ruby simple and powerful.

This mental model helps you understand how Ruby works under the hood.