ryanckulp

questions = {} # => create an empty Hash/object

questions['one'] = "What's your name?"
questions['two'] = "How old are you?"

ryanckulp

arr = [3, "four", {five: 'six'}]

ryanckulp

ages = [16, 15.6, 16.25, 17.1, 16.4, 15.8]

total_years = 0.0

ages.each do |age|
  total_years += age
end

total_years / ages.size # => 16.191666666666666

ryanckulp

groceries = ["apple", "pear", "banana"]

groceries.each do |grocery|
  puts grocery
end

# =>
 # apple
 # pear
 # banana

ryanckulp

questions = {
  'one' => {text: "What is 2 + 2?", answer: 4},
  'two' => {text: "What is 4 + 7?", answer: 11},
  'three' => {text: "What is 7 + 3?", answer: 10},
}

user_answers = {
  'one' => 4,
  'two' => 9,
  'three' => 10

ryanckulp

# verbose
if 2 + 2 == 4
  puts "Correct!"
end

# short-hand
puts "Correct" if 2 + 2 == 4

# more realistic short-hand
def addition_problem(user_answer, correct_answer)

ryanckulp

unless 2 + 2 == 4
  puts "Incorrect!"
end

ryanckulp

require 'date'

def date_night?
  Date.today.wday == 5 # friday
end

unless date_night?
  puts "study hard!"
end

ryanckulp

str_a = 'j.p. morgan'
str_b = 'jp morgan chase'

str_a == str_b # => false

str = 'j.p. morgan'

str.downcase.gsub("j.p.", "jp").gsub("j.p", "jp").gsub("jp.", "jp").gsub("jp morgan", "jp morgan chase") # => "jp morgan chase"

def jp_morgan_chase?(str)

ryanckulp

brew install yarn
rails new sample_app
cd sample_app
rails s
# visit http://localhost:3000 in your browser
rm -rf sample_app