week 4 lesson

block_function.rb

@@ -0,0 +1,12 @@
+def do_calc 
+   result = yield(7,9)
+   puts "#{result}" 
+end 
+
+do_calc do |a,b|
+    a + b 
+end
+
+do_calc do |a,b|
+    a * b 
+end

divisible.rb

@@ -0,0 +1,17 @@
+# Write a method that returns in an array all the numbers between 1 and 100 that are divisible by 2 or 3 or 5. 
+#Then call the method in your program and print out what it returns.  
+#Call the program divisible.rb.
+
+def numbers
+    result = []
+    (1..100).each do |i|
+     if i % 2 == 0 || i % 3 == 0 || i % 5 == 0 
+       puts result.push(i)
+        end
+    end
+    return result
+end
+
+
+
+puts numbers.inspect 

hangman.rb

@@ -0,0 +1,26 @@
+# Write a program hangman.rb that contains a function called hangman. 
+#The function's parameters are a word and an array of letters. 
+#It returns a string showing the letters that have been guessed. 
+#Call the function from within your program so that you know that it works.
+
+#Example: hangman("bob",["b"]) should evaluate to "b_b" 
+#Example: hangman("alphabet",["a","h"]) should return "a__ha___"
+
+#each do
+#include?
+
+def hangman(word, arr)
+    result = ""
+
+    word.each_char do |letters|
+    if arr.include?(letters) 
+        result += letters
+    else
+        result += "_"
+    end
+    end
+    return result
+end
+
+puts hangman("bob",["b"]) 
+puts hangman("alphabet",["a","h"]) 

hash_to_array.rb

@@ -0,0 +1,21 @@
+def keys_and_values(input_hash)
+  keys_array = input_hash.keys
+  values_array = input_hash.values
+
+  puts "Keys: #{keys_array}"
+  puts "Values: #{values_array}"
+end
+
+hash_pairs = {}
+
+5.times do
+  print "Enter a key: "
+  key = gets.chomp
+
+  print "Enter a value: "
+  value = gets.chomp
+
+  hash_pairs[key] = value
+end
+
+keys_and_values(hash_pairs)

sort_blocks.rb

@@ -0,0 +1,48 @@
+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 "Sorting alphabetically by author"
+
+new_array = book_array.sort do |a,b|
+  author1 = a.author.downcase
+  author2 = b.author.downcase
+  author1 <=> author2
+  # if author1 > author2
+  #   1
+  # elsif author1 < author2
+  #   -1
+  # else
+  #   0
+  # end
+end
+puts new_array
+
+puts "\n Sorting by Title"
+new_array = book_array.sort do |a,b|
+  author1 = a.title.downcase
+  author2 = b.title.downcase
+  author1 <=> author2
+end 
+puts new_array
+
+puts "\n Sorting by Count"
+new_array = book_array.sort do |a,b|
+  author1 = a.count
+  author2 = b.count
+  author1 <=> author2
+end 
+puts new_array

sums.rb

@@ -0,0 +1,25 @@
+class Sum1
+    attr_accessor :total 
+
+    def initialize(i, j)
+        @total = i + j
+    end
+
+end
+
+class Sum2
+    def initialize(a, b)
+       @a = a
+       @b = b
+    end
+    def new_total
+        @a + @b
+    end
+end
+
+sum1 = Sum1.new(5, 6)
+sum2 = Sum2.new(5, 6)
+
+puts "Total for Sum1: #{sum1.total}"
+
+puts "new_total for Sum2: #{sum2.new_total}"