Ruby Boolean statements are all about making decisions—your code asks “Is this true?” and acts accordingly. Let’s break it down 🧠💎

✅ What Is a Boolean?

In Ruby, a Boolean is a value that’s either:

• true (an instance of TrueClass)
• false (an instance of FalseClass)

These are used to control logic flow, especially in conditionals.

🔍 Truthy vs Falsy

Ruby treats everything as truthy except:

• false
• nil

That means even values like 0, "", and [] are considered true in conditionals.

if "hello"
  puts "This is truthy!"  # This will run
end

🧪 Boolean Expressions

You can create Boolean values using comparisons:

x = 10
puts x > 5     # true
puts x == 10   # true
puts x < 3     # false

🔗 Logical Operators

Combine Boolean expressions:

a = true
b = false

puts a && b  # AND → false
puts a || b  # OR → true
puts !a      # NOT → false

🧠 Using Booleans in Conditionals

age = 20

if age >= 18
  puts "You're an adult."
else
  puts "You're a minor."
end

Ruby checks whether the condition evaluates to true or false and runs the appropriate block.

❓ Predicate Methods

Ruby has methods that return Boolean values and end in a question mark:

[].empty?        # true
"hello".include?("e")  # true
nil.nil?         # true

You can even define your own:

def ready?
  true
end