Week 4 - Methods lesson

block_function.rb

@@ -0,0 +1,14 @@
+def do_calc
+  yield 7, 9
+  yield 7, 9
+end
+
+sum = do_calc do |a,b|
+  a+b
+end
+puts "Sum of 7 and 9 is: #{sum}" 
+
+prod = do_calc do |a,b|
+  a*b
+end
+puts "Product of 7 and 9 is: #{prod}"

divisible.rb

@@ -0,0 +1,16 @@
+def divisible(n)
+  numbers = []
+  number = 1
+  while number < n
+    if number % 2 == 0 or number % 3 == 0 or number % 5 == 0
+      numbers.push(number)
+    end
+  number += 1
+  end
+return numbers
+end
+
+n=100
+
+puts "All the numbers between 1 and #{n} that are divisible by 2 or 3 or 5: "
+print divisible(n)

hangman.rb

@@ -0,0 +1,17 @@
+def hangman(word, letters)
+  result = ""
+  word.each_char do |letter|
+  if letters.include?(letter)
+    result += letter
+    else
+    result += '_'
+    end
+  end
+return result
+end
+
+word = "Xenotransplantation"
+letters = ["a","b","c","d","e","X","o"]
+puts hangman(word, letters)
+puts hangman("bob", ["b"])
+puts hangman("alphabet",["a","h"])

hash_to_array.rb

@@ -0,0 +1,24 @@
+def ask(question)
+  print question
+  gets.chomp
+end
+
+def print_hash(hash={"b" => 200})
+  puts "Array of keys:"
+  puts hash.keys
+  puts "Array of values:"
+  puts hash.values
+end
+
+h=Hash.new
+while h.size < 5 do
+  key = ask("Enter the key: ")
+  while h.has_key?(key) == true do
+    puts "Key #{key} is already in the hash."
+    key = ask "Enter different key: "
+  end
+  value = ask "Enter the value for key #{key}: "
+  h[key]=value
+end
+
+print_hash(h)

sort_blocks.rb

@@ -0,0 +1,40 @@
+class Book
+  attr_reader :author, :title, :count
+  def initialize(author,title,count)
+    @author = author
+    @title = title
+    @count = count
+  end
+  def to_s
+    "author: #{author} title: #{title} count: #{count}"
+  end
+end
+
+book_array = []
+book_array.push(Book.new("Beatrice Potter","Peter Rabbit",25))
+book_array.push(Book.new("Henry Fielding","Tom Jones",12))
+book_array.push(Book.new("Bob Woodward","All the President's Men",30))
+
+puts "\nSorting alphabetically by author"
+new_array = book_array.sort do |a,b|
+  author1 = a.author.downcase
+  author2 = b.author.downcase
+  author1 <=> author2
+end
+puts new_array
+
+puts "\nSorting alphabetically by title"
+new_array = book_array.sort do |a,b|
+  title1 = a.title.downcase
+  title2 = b.title.downcase
+  title1 <=> title2
+end
+puts new_array
+
+puts "\nSorting by copies"
+new_array = book_array.sort do |a,b|
+  count1 = a.count
+  count2 = b.count
+  count1 <=> count2
+end
+puts new_array

sums.rb

@@ -0,0 +1,24 @@
+class Sum1
+  attr_accessor:total
+
+  def initialize(num1, num2)
+    @total = num1 + num2
+  end
+end
+
+class Sum2
+
+  def initialize(a,b)
+    @a = a
+    @b = b
+  end
+
+  def new_total
+    @a+@b
+  end
+end
+
+sum_one = Sum1.new(5,6)
+puts "Sum1 total result: ", sum_one.total
+sum_two = Sum2.new(5,6)
+puts "Sum2 new_total result: ", sum_two.new_total