Placeholder

commands.txt

@@ -4,71 +4,72 @@ Each Ruby command will return a value. Sometimes, these values are not what we e
 Try the following Commands:
 
 string = "Hello World"
-=> fill_in_what_irb_returns_here
+=> "Hello World"
 
 string.reverse
-=> fill_in_what_irb_returns_here
+=> "dlroW olleH"
 
 string
-=> fill_in_what_irb_returns_here
+=> "Hello World"
 
 array = [3,1,2]
-=> fill_in_what_irb_returns_here
+=> [3, 1, 2]
 
 array.sort
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3]
 
 array
-=> fill_in_what_irb_returns_here
+=> [3, 1, 2]
 
 array.sort!
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3]
 
 array
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3]
 
 => What do you think the exclamation mark indicates?
+Force save the sorted array.
 
 puts "Hello Ruby"
-=> fill_in_what_irb_returns_here
+=> nil
 
 array = [1,2,3,4]
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3, 4]
 
 array.each do |e|
   e**2
 end
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3, 4]
 
 array.each { |e| e**2 }
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3, 4]
 
 array
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3, 4]
 
 array.map do |e|
   e**2
 end
-=> fill_in_what_irb_returns_here
+=> [1, 4, 9, 16]
 
 array
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3, 4]
 
 array = [1,2,3]
 
 array.inject(0) do |sum, e|
   sum += e
   sum
 end
-=> fill_in_what_irb_returns_here
+=> 6
 
 array
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3]
 
 array.reject do |e|
   e > 2
 end
-=> fill_in_what_irb_returns_here
+=> [1, 2]
 
 array
-=> fill_in_what_irb_returns_here
+=> [1, 2, 3]