pengjunp

# Find the maximum 
def maximum(arr)
  result = nil
  if !arr.is_a? (Array)
  	result = "not an array"
  else
  	arr.each { |i| result = i if result == nil || i > result}
  	return result
  end
end

pengjunp

def fuzzbuzz (start_num, end_num)
  start_num.upto(end_num) do |i|
    if i % 5 == 0 && i % 3 == 0
      puts "FizzBuzz"
    elsif i % 5 == 0
      puts "Buzz"
    elsif i % 3 == 0
      puts "Fizz"
    else
      puts i

pengjunp

# must be baller and either furnished or rent cheaper than 2100
# def rent?(furnished, rent, baller)
#   if baller && (furnished || rent < 2100)
#     return true
#   else
#     return false
#   end
# end

pengjunp

# Save this file to your computer so you can run it 
# via the command line (Terminal) like so:
#   $ ruby shakil_the_dog.rb
#
# Your method should wait for user input, which corresponds
# to you saying something to your dog (named Shakil).
 
# You'll probably want to write other methods, but this 
# encapsulates the core dog logic
def shakil_the_dog

pengjunp

require 'benchmark'
# Sort the array from lowest to highest
def sort(arr)
  swap = true
  # Merge sort
  while swap
    swap = false
    for i in 0..arr.length - 1
      if i <= arr.length - 2 && arr[i] > arr[i + 1]
        greater = arr[i] 

pengjunp

Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger

pengjunp

def sign_price
  # declare the total price
  total = 0
  # calculate the size
  puts "Sign dimensions? length, width (feet)"
  dimensions = gets.chomp.split(',', 2)
  size = dimensions[0].to_f * dimensions[1].to_f
  total += 15 * size
  # calculate the colors
  puts "How many colors?"

pengjunp

def count_letters (s)
  result = Hash.new(0)
  s.gsub(/\s/, "").each_char {|c| result[c] += 1}
  puts result.inspect
end

count_letters("This is a random string that doesn't make any sense at all")

def letter_indices (s)
  result = {}

pengjunp

require 'rubygems'
require 'rest-client'

wiki_url = "http://en.wikipedia.org/"
wiki_local_filename = "wiki-page.html"

File.open(wiki_local_filename, "w") do |file|
   file.write(RestClient.get(wiki_url))
end

pengjunp

module Flight
  def Flight.fly(animal)
    if animal.superclass.name == "Bird" || name = animal.name == "Bat"
      "I'm a #{animal.name}, I'm flying!"
    end
  end
end