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APPENDIX A RUBY PRIMER AND REVIEW FOR DEVELOPERS
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One benefit of Ruby is that you can add features to classes even if they ve already been defined. Within the same program as before, you can simply reopen the class and add more definitions:
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class Person def name=(new_name) @name = new_name end def age=(new_age) @age = new_age end end
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These new methods are added to the Person class and are automatically made available to any existing instances of that class. These new methods are setter methods, as signified by the equal sign following their names. They allow you to do this:
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person1.name = "Barney" person2.age = 101 puts person1.name puts person2.age
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Barney 101
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Ruby can simplify most of the preceding work for you though, as it provides the
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attr_accessor helper method that automatically creates accessors and setter methods
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within a class for you.
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class Person attr_accessor :name, :age end
You can also create class methods: methods that don t exist within the scope of a single object, but that are bound directly to the class. For example:
class Person @@count = 0 def initialize @@count += 1 end
APPENDIX A RUBY PRIMER AND REVIEW FOR DEVELOPERS
def Person.count @@count end end a = Person.new b = Person.new c = Person.new puts Person.count
This Person class implements a count class method (notice that it is defined as Person.count, rather than just count, making it a class method). The count class method returns the value of a class variable (@@count) that stores the total number of Person objects created so far. Class variables begin with two @ signs and exist within the scope of a class and all its objects, but not within the scope of any specific object. Therefore, @@count equals 3 and only 3 once you ve created three Person objects. This section has given only a brief overview of classes, objects, and their special variables. For a detailed look at classes and objects, refer to 6.
Reflection
Ruby is often called a reflective language, as it supports reflection. Reflection is a process that allows a computer program to observe and modify its own structure and behavior during execution. This functionality can seem like a novelty to developers experienced with C, C++, and Perl, but it s incredibly important in terms of Ruby s operation and Ruby s ability to define domain-specific languages, making other forms of development easier. A brief demonstration of reflection is the ability to programmatically retrieve a list of all the methods associated with any object or class in Ruby. For example, here s how to display a list of all methods of the Hash class:
Hash.methods
["methods", "instance_eval", "display", "dup", "object_id", "instance_variables", "include ", "private_instance_methods", "instance_of ",
APPENDIX A RUBY PRIMER AND REVIEW FOR DEVELOPERS
"protected_method_defined ", "extend", "const_defined ", "eql ", "name", "public_class_method", "new", "hash", "id", "singleton_methods", "taint", "constants", "autoload", "frozen ", "instance_variable_get", "kind_of ", "ancestors", "to_a", "private_class_method", "const_missing", "type", "instance_method", "instance_methods", "protected_methods", "superclass", "method_defined ", "instance_variable_set", "const_get", "is_a ", "respond_to ", "to_s", "module_eval", "class_variables", "allocate", "class", "<=>", "<", "tainted ", "private_methods", "==", "public_instance_methods", "__id__", "autoload ", "===", "public_method_defined ", ">", "included_modules", "nil ", "untaint", "const_set", ">=", "method", "<=", "send", "inspect", "class_eval", "clone", "=~", "protected_instance_methods", "public_methods", "private_method_defined ", "__send__", "equal ", "freeze", "[]"]
Similarly, you can retrieve a list of methods available on a String object directly:
"testing".methods
["methods", "instance_eval", "%", "rindex", "map", "<<", "display", "split", "any ", "dup", "object_id", "sort", "strip", "size", "instance_variables", "downcase", "min", "gsub!", "count", "include ", "succ!", "instance_of ", "extend", "downcase!", "intern", "squeeze!", "eql ", "*", "next", "find_all", "each", "rstrip!", "each_line", "+", "id", "sub", "slice!", "hash", "singleton_methods", "tr", "replace", "inject", "reverse", "taint", "sort_by", "lstrip", "frozen ", "instance_variable_get", "capitalize", "max", "chop!", "kind_of ", "capitalize!", "scan", "select", "to_a", "each_byte", "type", "casecmp", "gsub", "protected_methods", "empty ", "to_str", "partition", "tr_s", "tr!", "match", "grep", "rstrip", "to_sym", "instance_variable_set", "next!", "swapcase", "chomp!", "is_a ", "swapcase!", "ljust", "respond_to ", "between ", "reject", "to_s", "upto", "hex", "sum", "class", "reverse!", "chop", "<=>", "insert", "<", "tainted ", "private_methods", "==", "delete", "dump", "===", "__id__", "member ", "tr_s!", ">", "concat", "nil ", "succ", "find", "untaint", "strip!", "each_with_index", ">=", "method", "to_i", "rjust", "<=", "send", "index", "collect", "inspect", "slice", "oct", "all ", "clone", "length", "entries", "chomp", "=~", "public_methods", "upcase", "sub!", "squeeze", "__send__", "upcase!", "crypt", "delete!", "equal ", "freeze", "unpack", "detect", "zip", "[]", "lstrip!", "center", "[]=", "to_f"]
The results given by the methods method might seem overwhelming at first, but over time they become incredibly useful. Using the methods method on any object allows you
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