puts "jimmy".length
puts "jimmy".upcase puts "jimmy".downcase
print "What's your first name?'" first_name = gets.chomp first_name.capitalize!
print "What's your last name?" last_name = gets.chomp last_name.capitalize!
print "What city do you live in?" city = gets.chomp city.capitalize!
print "What state are you from?" state = gets.chomp.upcase state.upcase!
puts "Your first name is #{first_name} and your last name is #{last_name}. You are from #{city}, #{state}."
hungry = false
unless hungry puts "I'm writing Ruby programs!" else puts "Time to eat!" end
print "Pleathe enter a thtring: " user_input = gets.chomp user_input.downcase!
if user_input.include? "s" user_input.gsub!(/s/, 'th') else "you did it with no s!" puts "your new phrase is #{user_input}" end
counter = 1 until counter == 11 puts counter counter = counter + 1 end
counter += 1
for num in 1...10
for num in 1..20 puts num end
i = 20 loop do i -= 1 next if i % 2 != 0 print "#{i}" break if i <= 0 end
odds = [1,3,5,7,9]
odds.each do |item| item *= 2 print "#{item}" end
text.split(",)
puts "enter something" text = gets.chomp
puts "enter words to be redacted" redact = gets.chomp
words = text.split(" ")
words.each { |letter| if letter == redact print "REDACTED " else print letter + " "
end}
my_2d_array = [["hi"],["there"],["fartface]]
pets = Hash.new pets["wynter"] = 'dog'
puts pets["wynter"]
languages = ["HTML", "CSS", "JavaScript", "Python", "Ruby"] languages.each{ |butt| puts butt}
s = [["ham", "swiss"], ["turkey", "cheddar"], ["roast beef", "gruyere"]] s.each do |sub_array| sub_array.each do |x| puts x end end
secret_identities = { "The Batman" => "Bruce Wayne", "Superman" => "Clark Kent", "Wonder Woman" => "Diana Prince", "Freakazoid" => "Dexter Douglas" } secret_identities.each do |hero, normal| puts "#{hero}: #{normal}" end
puts "Enter a phrase you'd like to analyze: " text = gets.chomp
words = text.split
frequencies = Hash.new(0)
words.each { |word| frequencies[word] += 1 }
frequencies = frequencies.sort_by do |word, count| count end
frequencies.reverse!
frequencies.each do |word, count| puts word + " " + count.to_s end
def what_up(greeting, *friends)
my_array = [1, 2, 3, 4, 5] my_array.each do |num| puts num * num end
fruits = ["orange", "apple", "banana", "pear", "grapes"] fruits.sort! do |firstFruit, secondFruit| secondFruit <=> firstFruit end
def alphabetize(arr, rev = false) arr.sort!
if rev == true arr.reverse! else arr end end
numbers = [1, 3, 5] puts alphabetize(numbers)
symbols = [] strings.each do |s| if s == strings symbols.push(s.to_sym) end end print symbols
movie_ratings = { memento: 3, primer: 3.5, the_matrix: 3, truman_show: 4, red_dawn: 1.5, skyfall: 4, alex_cross: 2, uhf: 1, lion_king: 3.5 } puts movie_ratings.select { |movie, rating| puts movie}
puts "What's your favorite language?" language = gets.chomp
case language when "Ruby" puts "Ruby is great for web apps!" when "Python" puts "Python is great for science." when "JavaScript" puts "JavaScript makes websites awesome." when "HTML" puts "HTML is what websites are made of!" when "CSS" puts "CSS makes websites pretty." else puts "I don't know that language!" end
movies = { Memento: 3, Primer: 4, Ishtar: 1 }
puts "What would you like to do?" puts "-- Type 'add' to add a movie." puts "-- Type 'update' to update a movie." puts "-- Type 'display' to display all movies." puts "-- Type 'delete' to delete a movie."
choice = gets.chomp.downcase case choice when 'add' puts "What movie do you want to add?" title = gets.chomp if movies[title.to_sym].nil? puts "What's the rating? (Type a number 0 to 4.)" rating = gets.chomp movies[title.to_sym] = rating.to_i puts "#{title} has been added with a rating of #{rating}." else puts "That movie already exists! Its rating is #{movies[title.to_sym]}." end when 'update' puts "What movie do you want to update?" title = gets.chomp if movies[title.to_sym].nil? puts "Movie not found!" else puts "What's the new rating? (Type a number 0 to 4.)" rating = gets.chomp movies[title.to_sym] = rating.to_i puts "#{title} has been updated with new rating of #{rating}." end when 'display' movies.each do |movie, rating| puts "#{movie}: #{rating}" end when 'delete' puts "What movie do you want to delete?" title = gets.chomp if movies[title.to_sym].nil? puts "Movie not found!" else movies.delete(title.to_sym) puts "#{title} has been removed." end else puts "Sorry, I didn't understand you." end
puts "I love love" if true
puts 1 < 2? "One is less than two!" : "One is not less than two."
my_array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
my_array.each do |x| puts x % 2 == 0? x : nil end
"L".upto("P") do |letter| puts letter end
favorite_animal ||= "tiger"
5.times do |x| puts "I'm a block!" end
def yield_name(name) puts "In the method! Let's yield." yield("Kim") puts "In between the yields!" yield(name) puts "Block complete! Back in the method." end
yield_name("Eric") { |n| puts "My name is #{n}." }
yield_name("jimmy") { |n| puts "My name is #{n}!"}
round_down = Proc.new do |x| x.floor
hi = Proc.new { puts "Hello!"} hi.call
strings = ["leonardo", "donatello", "raphael", "michaelangelo"]
symbolize = lambda { |x| x.to_sym}
symbols = strings.collect(&symbolize) print symbols
symbolize = lambda { |x| x.to_sym}
my_array = ["raindrops", :kettles, "whiskers", :mittens, :packages]
symbol_filter = lambda { |x| x.is_a? Symbol } symbols = my_array.select(&symbol_filter) puts symbols
class Language def initialize(name, creator) @name = name @creator = creator end
def description puts "I'm #{@name} and I was created by #{@creator}!" end end
ruby = Language.new("Ruby", "Yukihiro Matsumoto") python = Language.new("Python", "Guido van Rossum") javascript = Language.new("JavaScript", "Brendan Eich")
ruby.description python.description javascript.description
class ApplicationError def display_error puts "Error! Error!" end end
class SuperBadError < ApplicationError end
err = SuperBadError.new err.display_error
class Creature def initialize(name) @name = name end
def fight return "Punch to the chops!" end end
class Dragon < Creature def fight puts "Instead of breathing fire..." super end end
"Instead of breathing fire..." "Punch to the chops!"
class Message @@messages_sent = 0 def initialize(from, to) @from = from @to = to @@messages_sent += 1 end end
my_message = Message.new("butts", "faces")
class Email < Message def initialize(from, to) super end end
class Computer @@users = {} def initialize(username, password) @username = username @password = password @files = {} @@users[username] = password end
def create(filename) time = Time.now @files[filename] = time puts "#{filename} was created at #{time} by #{@username}. " end
def Computer.get_users @@users
end end my_computer = Computer.new("my shit", "othershit")