methods.md

Definitely know:

1. Create a method called greeting that takes in no inputs and prints "Hello… you" to the screen

   example output) hello…you

2. Create a method called personal_greeting that takes in an input and uses that input to print a personalized greeting

   example output) hello Arjun

3. If you want the following script to print "hello" to the screen, what should be changed?

   def print_hello
     puts "hello"
   end
   

4. What are the two ways I can call the following method?

   def print_hello(name)
     puts "hello " + name
   end
   

5. If you want to the following script to print "hello Arjun" to the screen, what should be changed?

   def print_hello(zebra)
        puts "hello " + name
   end
   
   print_hello("Arjun")
   

6. If you want to the following script to print "hello Jeff Cohen" to the screen, what should be changed?

   def print_hello(first_name, last_name)
        puts "hello " + name
   end
   
   print_hello("Jeff", "Cohen")
   

7. If you want to the following script to print "hello Jeff Cohen" to the screen, what should be changed?

   def print_hello(first_name, last_name)
        puts "hello " + first_name + " " + last_name
   end
   
   print_hello ("Jeff", "Cohen")
   

8. Explain what is going on under the hood when the following method is called. What is the output of the following method call?

   def add_numbers(first_num, second_num, third_num)
     sum = first_num + second_num + third_num
     return sum
   end
   
   add_numbers(3, 7, 8)
   

9. What is the output of the following method call? How do you know?

   def add_numbers(first_num, second_num, third_num)
     sum = first_num + second_num + third_num
     puts sum
     return 15
   end
   
   add_numbers(3, 7, 8)
   

10. What is the output of the following method call? How do you know?

    def add_numbers(first_num, second_num, third_num)
      first_num + second_num + third_num
    end
    
    add_numbers(3, 7, 8)
    

11. What gets saved into x?

    def add_numbers(first_num, second_num, third_num)
      sum =  first_num + second_num + third_num
      return sum
    end
    
    x = add_numbers(3,7,8)
    

12. What gets saved into x?

    def add_numbers(first_num, second_num, third_num)
      sum =  first_num + second_num + third_num
      puts sum
    end
    
    x = add_numbers(3,7,8)
    

Good to know:

9. What are the benefits to using a method in script 2 compared to not using a method in script 1. Are there any drawbacks to using a method?

   Script 1

   puts "Staff"
   puts "===="
   
   puts "Arjun is from Schaumburg. Arjun's favorite number is 3."
   puts "-------------------------------------------------------"
   puts # creates a new line
   
   puts "Raghu is from Goshen. Raghu's favorite number is 21."
   puts "----------------------------------------------------"
   puts
   
   puts "Jeff is from Skokie. Jeff's favorite number is 7."
   puts "-------------------------------------------------"
   puts
   

   Script 2

   def print_name(name, hometown, fav_num)
        message = "#{name} is from #{hometown}. #{name}'s favorite number is #{fav_num}."
        puts message
        puts "-" * message.length
        puts
   end
   
   puts "Staff"
   puts "===="
   
   print_name("Arjun", "Schaumburg", 3)
   print_name("Raghu", "Goshen", 21)
   print_name("Jeff", "Skokie", 7)