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What are your favorite Ruby features?
Instance-specific behavior / metaclasses
Duck typing
Reflection
Operator overloading (in novel ways)
Redefining the behavior of core types
Code in class body (and metaprogramming with it)
Singleton classes
Definable MyObject#method=
First class regexps
Continuations e.g. callcc
Optional parens / English-like readability
Mix-ins / Modules
Enumerators (Ruby 1.8.7+/Ruby 1.9)
Module#module_eval / Module#class_eval
Open classes / monkeypatching
Module#define_method
Object#method_missing
Ternary expressions e.g. foo ? bar : baz
Syntactic sugar e.g. val ||= x; array << val
Object#instance_eval / Object#instance_exec
Standard library (and its use of blocks)
Splats e.g. method(*args)
Creating Domain Specific Languages
Metaprogramming
Object#method(s) / Module#instance_method(s)
Definable MyObject#[] and MyObject#[]=
Use of operators by core types (e.g. Array#*)
Blocks
ObjectSpace
Embedding code in strings with "#{mycode}"
Object#class / Object#is_a?
MyObject#method? and MyObject#method! idiom
Object#instance_variable_get / Object#instance_variable_set
RubyGems
Enumerable
Lambdas / procs
Created on Feb 15, 2009
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