quick_class

Install it with gem install quick_class or gem 'quick_class' - you know the drill.

Usage:

First default a class and call attributes=:

require 'quick_class'

class Foo < QuickClass
  self.attributes = { a: 0, b: 1 }
end

print Foo.attributes
# => {:a=>0, :b=>1}

initialize is generated and converted any passed arguments to instance variables. The instance variables are accessible through generated attr_accessor functions.

Foo.new
# => #<Foo:xxxxxxxxxxxxxxx>

foo = Foo.new a: 2
# => #<Foo:xxxxxxxxxxxxxxx @a=2>

foo.a
# => 2

foo.a = 3
# => 3

The default method is also defined, which is the same as passing attributes to initialize:

Foo.default
# => #<Foo:xxxxxxxxxxxxxxx @a=0, @b=1>

It accepts arguments as well:

Foo.default b: 2
# => #<Foo:xxxxxxxxxxxxxxx @a=0, @b=2>

It works with interitance also:

class Bar < Foo
  self.attributes = { c: 2 }
end

Bar.default
# => <Bar:xxxxxxxxxxxxxxx @a=0, @b=1, @c=2>

Internally, the attributes= method is dynamically generating attr_accessor and default functions.

It can be called multiple times, and these methods will correctly update:

class Foo < QuickClass
  self.attributes = { a: 0 }
end

Foo.default.a
# => 0

Foo.attributes = { b: 1 }

Foo.default.a
# => NoMethodError

Foo.default.b
# => 1

The whole source code is 12 un-minified lines without comments.

use at own risk

todo

implement attributes#delete and attributes[]=