Ruby
- 1. Ruby Programming == Joy Krupa Suthar
- 2. Why named ‘Ruby’? ● Influenced by majorly - Perl ● July Birthstone
- 3. Idea behind Ruby ● Yukihiro Matsumoto(‘Matz’) and a colleague were discussing of creating language with more scripting power than Perl and more object-oriented than Python ● Born in 1993 ● Features ○ Truly Object-Oriented ○ Portable ○ Garbage Collector ○ Exception handling ○ Syntactically simple
- 4. Get started with Ruby ● Version Manager - rbenv, rvm ● Install ● Irb - Interactive Ruby shell
- 7. Everything is OBJECT ● Including their properties and actions ● Everything has value, even if that value is nil ● No difference between an expression and statement ● =, .. , &&, ||, or, ::
- 9. Ruby’s Flexibility ● Allow user to freely alter its parts ● No restrictions ● Open classes ● Ability to change any inbuilt methods ● Ability to change core classes like Fixnum
- 11. Blocks - Truly expressive ● Add closure to method and closure will tell method how to act ● Invoke with yield ● block_given? ● Block with variables
- 13. Ruby and Mixin ● Ruby does not support multiple inheritance ● Mixins allows to achieve by requiring multiple modules ● Modules - Collection of methods, constants, other module and class definitions ● Class can access modules by requiring
- 15. Ruby’s visual appearance ● Code readable like story ● Simple naming conventions ○ snake_case - Method name ○ CamelCase - Class name ○ @var - Instance variable ○ var - Local variable ○ $var - Global variable
- 16. Things you need to know about Ruby nil and false ● Everything except nil and false is considered true ● In Java and some other languages, 0 and possibly other values such as empty list, are considered false Access Modifiers ● Modifiers ● Scopes
- 17. Expressive method names ● Methods answering question return with Question mark (?) E.g. Array#empty? ● ‘Dangerous’ methods end with Exclamation mark (!) E.g. save! Singleton methods ● Per-object methods. They are only available on the Object you defined it on.
- 19. Message passing, not function calls ● A method call is really a message to another object Keyword arguments ● Like Python, Ruby also allows to use keyword as argument Missing methods ● missing_method error ● NameError
- 21. RubyGems ● What are Gems? ● Installing Gem ● Bundler ● Using Gems
- 22. Thank You ! Any Questions??