Ruby Symbols And More about Methods

Ruby Symbols:

# Symbols start with a colon 
:action.class == Symbol 
:action.to_s == "action" 
:action == "action".to_sym 
 
# There is only one instance of every symbol 
:action.equal?(:action) # => true 
'action'.equal?('action') # => false 
 
# Symbols are typically used as keys in hashes 
my_hash = {:controller => "home", :action => "index"} 

More about Methods:

• Arbitrary number of arguments: def my_methods(*args)
• Converting Array to arguments: my_method([a, b]*)
• Dynamic method invocation: object.send(:method_name)
• Duck typing: object.respond_to?(:method_name)
• If the last argument is a Hash, the braces can be omitted: link_to("Home", :controller => "home")

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