LHL W1D2 Exercise

IRB w1d2

2.1.3 :001 > def say_hi(name)
2.1.3 :002?>   "Hi, #{name}"
2.1.3 :003?>   end
 => :say_hi 
2.1.3 :004 > say_hi("Matt")
 => "Hi, Matt" 
2.1.3 :005 > my_array=[5,3,7,2]
 => [5, 3, 7, 2] 
2.1.3 :006 > my_array.sort
 => [2, 3, 5, 7] 
2.1.3 :007 > my_array
 => [5, 3, 7, 2] 
2.1.3 :008 > my_array.sort!
 => [2, 3, 5, 7] 
2.1.3 :009 > an_array = ['Hello', 'nurse', 'and', 'world']
 => ["Hello", "nurse", "and", "world"] 
2.1.3 :010 > an_array.each {|word| puts word }
Hello
nurse
and
world
 => ["Hello", "nurse", "and", ""world"] 
2.1.3 :011 > include Math
 => Object 
2.1.3 :012 > Math.sqrt(144)
 => 12.0