What is the difference between include and extend in Ruby?

What is the difference between include and extend in Ruby?

ruby module include extend

ruby

Difference between a class and a module

ruby class module

ruby

Can I invoke an instance method on a Ruby module without including it?

ruby module methods

ruby

ruby inheritance vs mixins

ruby class inheritance module mixins

ruby

Create module variables in Ruby

ruby module class-variables

ruby

What is mattr_accessor in a Rails module?

ruby-on-rails ruby class module activesupport

ruby

Rails /lib modules and

ruby-on-rails ruby class module

ruby

How can I initialize a module's instance variables in Ruby?

ruby module instance-variables

ruby

Scope of Constants in Ruby Modules

ruby-on-rails ruby module constants

ruby

ruby module_function vs including module

ruby module mixins

ruby

Ruby: module, require and include

ruby module mixins

ruby

Rails: How do I write tests for a ruby module?

ruby-on-rails ruby unit-testing testing module

ruby

Is "extend self" the same as "module_function"?

ruby module

ruby

Overriding method by another defined in module

ruby methods module

ruby

Instance variables in modules?

ruby module

ruby