Ruby revision. Working through "The Well-Grounded Rubyist. 3rd Edition."
Identifiers:
- Variables
- local
- instance
- class
- global
- Constants
- Keywords
- Method names
Every object is capable of understanding a certain set of messages. Each message that an object understands corresponds directly to a method — a named, executable routine whose execution the object has the ability to trigger.
x = "100".to_i
x = the result of sending the message to_i to the string "100" (an object)
puts "hello!" is the same as self.puts("hello!")
A class defines an object’s functionality, and every object is an instance of exactly one class.