Friday Oct 12

assignment.rb

# Assignment

# write a true expression using ==
a == a
# write a false expression using ==
a == b

# write a true expression using !=
true != false
# write a false expression using !=

# Write an if statement with 3 different branches
# use !=, ==, and > in those branches
if x != 1
	puts "it's not one"
elsif x == 2
	puts "it's two"
elseif x > 3
	puts "it's greater than three"
end


# Assign a variable based on the result of an if statement
# Execute code based on the result of an if statement.
# conditionally run puts "Hello Class" if 1 < 2
# Try using an if statement at the end of an expression

x = "Hello class" if 1 < 2
puts x


# Write an if statement that negates the or condition to create a true return

if x == 1 || x == 2
	puts "it's either one or two"
end

# Write an if statement that users the and operator to create a false return

if x > 10 && x < 15
	puts "it's between 10 and 15"
end

# Write a Case Statement that checks if a variable is a vowel
vowel = [a, e, i, o, u]
input == gets.chomp
case letter
	when vowel.includes?(input)
		puts "this is a vowel"
	else
		puts "this isn't a vowel"
	end
end 

# Write that same case as an if statement
# Write a Case statement that has at 4 branches and a default return
vowel = [a, e, i, o, u]
letter = gets.chomp
if letter == a
	puts "this is a vowel"
elsif letter == e
	puts "this is a vowel"
elsif letter == i
	puts "this is a vowel"
elsif letter == o
	puts "this is a vowel"
elsif letter == u
	puts "this is a vowel"
else 
	puts "this is not a vowel"
end

# Assignment
# Write a while loop that runs exactly 5 times
5.times do
	puts "hello nurse"
end

# Write a while loop that counts from 1 to 10 and puts all odd numbers
# => you can check if a number is odd by calling the odd? method on it.
# => 1.odd? will return true
while x < 10
	(1..10).each do |x|
		puts x if x.odd?
	end
end

success = "this is a vowel"
# Write a Case Statement that checks if a variable is a vowel
print "Enter your variable to check: "
variable = gets.chomp
variable = variable.downcase
case 
	when variable.match(/[aeiou]/)
		puts success
	else
		puts "this is not a vowel"
	end

# Write that same case as an if statement
success = "this is a vowel"
def check_var(var)
	"#{var.downcase}".each do |letter|
		if letter == "a"
			print "A"
		elsif letter == "e"
			print "E"
		elsif letter == "i"
			print "I"
		elsif letter == "o"
			print "O"
		elsif letter == "u"
			print "U"
		else 
			print "no vowels"
		end
	end
end
		
# Write a Case statement that has at 4 branches and a default return
print "Enter your variable to check: "
variable = gets.chomp
variable = variable.downcase
case variable
	when "hi"
		puts "hi to you too"
	when "e"
			puts "eeee"
	when "i"
			puts "there is no I in team, but their is an I in win"
	when "o"
			puts "oooo la la"
	else
		puts "why don't you type hi, e, i, or o instead?"
	end
# Write a while loop that runs exactly 5 times
5.times do puts "hello nurse" end
# Write a while loop that counts from 1 to 10 and puts all odd numbers
# => you can check if a number is odd by calling the odd? method on it.
# => 1.odd? will return true


(1..10).each do |num|
	puts num if num.odd?
 end

# Construct an array with your favorite foods. It should have at least
# 5 elements.
fav_foods = ["lobster", "chicken", "pizza", "apples", "pears"]
# puts your most favorite food out of that array
puts fav_foods[2]
# Construct an array with the colors of the rainbow (ROYGBIV)
colors = ["red", "Orange", "Yellow", "green", "blue", "indigo", "violet"]
# Slice the colors Red, Orange, and Yellow out of the array
puts colors.slice(0,3)
# Start with an empty array and then fill the second and 6th position
empty = []
empty[1] = "2nd"
empty[5] = "6th"
puts empty
#
# Create a variable that stores your name as a string.
name = "Adam"
# Send that variable (string object) the upcase method.
name = name.upcase
# Try to slice the middle letter of your name out of the string.
name= name.slice(2,2)
# http://ruby-doc.org/core-1.9.3/String.html#method-i-slice
puts name

# Chain at least 5 method calls to an object.
str = " chicken ".strip.upcase.slice(0,5).downcase.concat("s are cute")
# chicken
# CHICKEN
# CHICK
# chick
# Chicks are cute
puts str

# Reduce this operation one chain at a time.
# Example:

# Full Chain:
# puts "start".reverse.slice(0,2).concat("uth").capitalize
# trats
#tr
#truth
#Truth

# At any given point in the chain, there is an evaluation
# that then receives the next method call

# Try to use as many of the string methods as possible.
# Literally, try to write a ruby script that demonstrates the usage of
# every string method

# Iterate through all the letters in your name outputing all vowels.
def output_var(name)
	"#{name}".each_char do |letter|
		letter = letter.downcase
		case
			when letter.match(/[aeiou]/)
				puts letter
			end
	end
end

output_var("Adam")

# Given this List of Songs, Construct Arrays by Artist and Album
# Hint: Make use of the split() String Method
# http://www.ruby-doc.org/core-1.9.3/String.html#method-i-split

# Simple Example of Data Parsing

songs = [
"The Magnetic Fields - 69 Love Songs - Parades Go By",
"The Magnetic Fields - Get Lost - Smoke and Mirrors",
"The Magnetic Fields - Get Lost - You, Me, and the Moon",
"The Magnetic Fields - 69 Love Songs - The Book of Love",
"Neutral Milk Hotel - In An Aeroplane Over the Sea - Holland 1945",
"Neutral Milk Hotel - In An Aeroplane Over the Sea - The King of Carrot Flowers"
]

artist = []
album = []
tracks = []

songs.each do |song|
	piece = song.split("-")
		artist << piece[0]
		album << piece[1]
		tracks << piece[2]

		artist = artist.uniq
		album = album.uniq
		tracks = tracks.uniq
end

 	puts "These are the artists: #{artist}"
 	puts "These are the albums: #{album}"
 	puts "These are the songs: #{tracks}"