rubyplayground.rb

2.2.1 :001 > def say_hi(name)
2.2.1 :002?>   "Hi, #{name}"
2.2.1 :003?>   end
 => :say_hi 
2.2.1 :004 > say_hi("stu")
 => "Hi, stu" 
2.2.1 :005 > my_array = [4, 7, 1, 0]
 => [4, 7, 1, 0] 
2.2.1 :006 > my_array.sort
 => [0, 1, 4, 7] 
2.2.1 :007 > my_array
 => [4, 7, 1, 0] 
2.2.1 :008 > my_array.sort!
 => [0, 1, 4, 7] 
2.2.1 :009 > my_array
 => [0, 1, 4, 7] 
2.2.1 :010 > an_array = ["stu", "kate", "haggy"]
 => ["stu", "kate", "haggy"] 
2.2.1 :011 > an_array.each { |x| puts x }
stu
kate
haggy
 => ["stu", "kate", "haggy"] 
2.2.1 :012 > Math.sqrt(1282)
 => 35.805027579936315 
2.2.1 :013 > Time.now
 => 2016-03-29 11:26:53 -0400 
2.2.1 :014 > array.new (10, 'bee')
SyntaxError: (irb):14: syntax error, unexpected ',', expecting ')'
array.new (10, 'bee')
              ^
(irb):14: syntax error, unexpected ')', expecting end-of-input
	from /Users/stupeters/.rvm/rubies/ruby-2.2.1/bin/irb:11:in `<main>'
2.2.1 :015 > array.new(10, 'bee')
NameError: undefined local variable or method `array' for main:Object
	from (irb):15
	from /Users/stupeters/.rvm/rubies/ruby-2.2.1/bin/irb:11:in `<main>'
2.2.1 :016 > Array.new(10, 'bee')
 => ["bee", "bee", "bee", "bee", "bee", "bee", "bee", "bee", "bee", "bee"] 
2.2.1 :017 > include Math
 => Object 
2.2.1 :018 > sqrt 64
 => 8.0