Ruby

Methods

def print_hello_world
  puts "Hello world!"
end

print_hello_world

def greet(name)
  puts "Hello, #{name}!"
end

greet("Alice") # Output: Hello, Alice!
greet("Bob") # Output: Hello, Bob!

def add_numbers(num1, num2)
  sum = num1 + num2
  puts "The sum is #{sum}."
end

add_numbers(5, 3)

def greet(name="Guest")
  puts "Hello, #{name}!"
end

greet() # Output: Hello, Guest!
greet("Alice") # Output: Hello, Alice!

def greet(first_name, last_name)
  puts "Hello, #{first_name} #{last_name}!"
end

greet("Alice", "Smith") # Output: Hello, Alice Smith!

def greet(first_name:, last_name:)
  puts "Hello, #{first_name} #{last_name}!"
end

greet(first_name: "Alice", last_name: "Smith") # Output: Hello, Alice Smith!

def greet(first_name: "Guest", last_name: "User")
  puts "Hello, #{first_name} #{last_name}!"
end

greet() # Output: Hello, Guest User!
greet(first_name: "Alice") # Output: Hello, Alice User!