Why everything is an object in Ruby - Visual Breakdown

Concept Flow - Why everything is an object in Ruby

Start: Ruby code runs

↓

Create value (e.g., number, string)

↓

Wrap value in an object

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Call method on object

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Return result

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End

Ruby treats every value as an object, so when code runs, values are wrapped as objects allowing method calls on them.

Execution Sample

Ruby

num = 5
puts num.class
puts num.to_s

This code shows that the number 5 is an object of class Integer and calls a method to convert it to a string.

Execution Table

Step	Action	Value	Object Class	Method Called	Output
1	Assign 5 to num	5	Integer object	None	None
2	Call num.class	5	Integer object	class	Integer
3	Call num.to_s	5	Integer object	to_s	5
4	puts outputs	Integer	Class object	puts	Integer
5	puts outputs	5	String object	puts	5

💡 All values are objects, so methods like class and to_s can be called on them.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
num	undefined	5 (Integer object)	5 (Integer object)	5 (Integer object)	5 (Integer object)

Key Moments - 2 Insights

Why can we call methods like .class or .to_s on a number?

Because in Ruby, numbers are objects of class Integer, so they have methods attached. See execution_table rows 2 and 3.

Is the value 5 just a number or an object?

It is an Integer object, not just a raw number. Ruby wraps all values as objects. See variable_tracker and execution_table row 1.

Visual Quiz - 3 Questions

Look at the execution table, what is the output of num.class?

A String

B 5

C Integer

D Object

💡 Hint

Check execution_table row 2 under Output column.

At which step is the method to_s called on num?

A Step 3

B Step 1

C Step 2

D Step 4

💡 Hint

Look at execution_table Method Called column.

If num was a string "5" instead of integer 5, what would num.class return?

A Integer

B String

C Object

D Fixnum

💡 Hint

Recall that strings are objects of class String in Ruby.

Concept Snapshot

In Ruby, everything is an object.
All values like numbers, strings, true/false are objects.
Objects have classes and methods.
You can call methods on any value.
This makes Ruby very consistent and flexible.

Full Transcript

When Ruby runs code, every value you create is actually an object. For example, the number 5 is not just a number but an Integer object. This means it has methods like class and to_s you can call. In the example, num = 5 assigns an Integer object to num. Calling num.class returns Integer, showing its class. Calling num.to_s converts it to a string "5". This shows Ruby treats all values as objects, allowing method calls on them. This consistent object model is why Ruby is easy and powerful to use.