Ruby homework, day 4.

Vowels

=begin

Let's go back to the exercise where we determined what 
is and isn't a vowel. With ruby, there's always more than 
one way to do something and get the same result.

Assuming vowels a,e,i,o,u:

#1 Write a method that returns whether a given letter is a vowel, 
using if and elsif
#2 Write a method that returns whether a given letter is a vowel, 
using case
#3 Write a method that returns whether a given letter is a vowel, 
using if with no else, all on a single line
#4 Write a method that returns whether a given letter is a vowel 
without using if or case while all on a single line
#5 Write a method that returns whether a given letter is a vowel 
without checking equality, or the use of if, using the array 
of vowels
#6 Write a method that will evaluate a string and return the 
first vowel found in the string, if any
Write a method that will evaluate a string and return the 
ordinal position (index) of the string where the first vowel 
is found, if any
hint: remember that every line of ruby code has a return value, 
and that a method will return the result of the last operation

=end

letter = "a"
string = "rosie"
vowels = ["a", "e", "i", "o", "u"]

#1
def vowel_ifelse(letter)
  if letter.include?("a")
		puts "It's a vowel!"
	elsif letter.include?("e")
		puts "It's a vowel!"
	elsif letter.include?("i")
		puts "It's a vowel!"
	elsif letter.include?("o")
		puts "It's a vowel!"
	elsif letter.include?("u")
		puts "It's a vowel!"
	else
		puts "It's NOT a vowel!"
	end
end
vowel_ifelse(letter)

#2
def vowel_case(letter)
	case(letter)
	when "a"
		puts "It's a vowel!"
	when "e"
		puts "It's a vowel!"
	when "i"
		puts "It's a vowel!"
	when "o"
		puts "It's a vowel!"
	when "u"
		puts "It's a vowel!"
	else
		puts "It's NOT a vowel!"
	end
end
vowel_case(letter)

#3
def vowel_if(letter)
	puts "It's a vowel!" if "aeiou".include?(letter)
end
vowel_if(letter)

#4
def vowel_singleline(letter)
	("aeiou".include?(letter)) && (puts "It's a vowel!")
end
vowel_singleline(letter)

#5
def vowel_array

end

#6
def first_vowel

end