Lesson 2: Everything is an Object 

• Objects have methods

$ irb
irb(main):001:0> answer.methods.sort
=> ["%", "*", "**", "+", "+@", "-", "-@", "/", "<", "<=", "<=>", 
"==", "===", "=~", ">", ">=", "__id__", "__send__", "abs",
"between?", "ceil", "class", "clone", "coerce", "display", "div", 
"divmod", "dup", "eql?", "equal?", "extend", "finite?", "floor",
"freeze", "frozen?", "hash", "id", "infinite?", "inspect",
"instance_eval", "instance_of?", "instance_variable_get",
"instance_variable_set", "instance_variables", "integer?", "is_a?",
"kind_of?", "method", "methods", "modulo", "nan?", "nil?",
"nonzero?", "object_id", "prec", "prec_f", "prec_i",
"private_methods", "protected_methods", "public_methods", "quo",
"remainder", "respond_to?", "round", "send", "singleton_method_added",
"singleton_methods", "step", "taint", "tainted?", "to_a", "to_f",
"to_i", "to_int", "to_s", "truncate", "type", "untaint", "zero?"]