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Make class variables more accessible quick

Accessors are ways to quickly make a class’s instance variables readable or writable. Instead of having to define specific methods for seeing or editing instance variables, these make the code simpler and more readable.

For instance, this method…

def variable

…can be replaced with what’s below. The effect is the same.

attr_reader :variable

Here’s a quick reference to the different accessors and what they do.

Shortcut Effect
attr_reader :v def v; @v; end
attr_writer :v def v=(value); @v=value; end
attr_accessor :v attr_reader :v; attr_writer :v
attr_accessor :v, :w attr_accessor :v; attr_accessor :w