code for chapter 3 in ruby

03_recursion/ruby/01_countdown.rb

@@ -0,0 +1,12 @@
+def countdown(i)
+  puts i
+  # base case
+  if i <= 0
+    return
+  # recursive case
+  else
+    countdown(i - 1)
+  end
+end
+
+countdown(5)

03_recursion/ruby/02_greet.rb

@@ -0,0 +1,16 @@
+def greet2(name)
+  puts "how are you, #{name}?"
+end
+
+def bye
+  print "ok bye!"
+end
+
+def greet(name)
+  puts "hello, #{name}!"
+  greet2(name)
+  puts "getting ready to say bye..."
+  bye
+end
+
+greet("adit")

03_recursion/ruby/03_factorial.rb

@@ -0,0 +1,9 @@
+def fact(x)
+  if x == 1
+    1
+  else
+    x * fact(x - 1)
+  end
+end
+
+puts fact(5)