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demo.rb

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+def duplicate-hash(array)
+  hash = {}
+  array.each {
+    |i| if hash.has_key?(i) hash[:i] += 1 
+   else hash[:i] = 1 
+   end
+  } 
+
+end

learning-if-end.rb

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+#run_code_inside = false
+#puts "Code before if...end"
+#if run_code_inside
+ # puts "code inside"
+# end
+# puts "Code after if...end"
+
+chance_of_rain = -23
+# puts "Let's go outside!"
+# if chance_of_rain <= 0.25
+#  puts "Pack a sun shelter!"
+# elsif (chance_of_rain > 0.25 && chance_of_rain < 0.75)
+#  puts "Pack an umbrella!"
+# else
+#  puts "Stay home and read Hegel."
+# end
+
+# puts "You know what year it is??"
+# this_year = Time.now.year
+# puts "Hey, it's 2019!" if
+# this_year == 2019
+
+greeting = "friendly_greeting"
+
+case greeting
+  when "unfriendly_greeting"
+    puts "What do you want!?"
+  when "friendly_greeting"
+    puts "Hi! How are you?"
+  end