Types of arguments in Ruby | Parameters in Ruby

 

In Ruby, arguments can be classified into several types based on how they are passed to the methods. Let's see each argument type with an example:

1. Required arguments:

• This argument must be provided when calling a method, otherwise, it will throw the argument error.

    def greet(name, country)
        puts "My name is  #{name} and I am from #{country}"
    end
    greet("Yash", "India")

• If we pass only one argument it will throw the below error 

        `greet': wrong number of arguments (given 1, expected 2) (ArgumentError)

2. Default arguments:

• Default arguments have predefined values that will be used when no arguments are passed to the method.

    def greet(name="Yash")

        puts "My name is  #{name} "

    end

    greet

3. Variable arguments:

• They allow a method to accept a variable number of arguments. This argument is also known as the splat argument.

    def total(*num)

        puts num.sum

    end

    total(1, 2, 3)

4. Keywords Arguments:

• These arguments are passed by name, order doesn't matter it provides more flexibility and clarity.

     def greet(name: , country: )

      puts "My name is #{name} and i am from #{country}"

  end  

  greet(country: "India", name: "Yash")

5. Block Arguments:

• In Ruby, the method can also accept the block. A block of code is passed in the method as an argument. Block is passed implicitly using the yield keyword or explicitly using the &block keyword.

    def greet

      yield("Yash")

  end

  greet { |name| puts "Hello #{name}"}

    OR

  def greet(&block)

      block.call("Yash")

  end

  greet { |name| puts "Hello #{name}"}

These are the main types of arguments each serving a different purpose and providing flexibility.