Any

Any is a simple gem. When you compare it against anything, it's always true.

This is a play at Scala's Any type, mostly used for pattern matching type techniques.

• https://docs.scala-lang.org/tour/unified-types.html
• https://www.scala-lang.org/api/2.12.3/scala/Any.html

Thanks to @soffes for allowing me to repurpose the gem Any!

The original will be maintained at versions 0.0.1 and 0.0.2 from this repo

Note that I'm using Qo here. If these two issues are added in Ruby 2.6+ it'll enable us to do this without the need for Qo:

• Hash#=== - https://bugs.ruby-lang.org/issues/14869
• Array#=== - https://bugs.ruby-lang.org/issues/14916

I've commented on each to note this.

For now, I will leave Qo in the specs so that we don't have a hard dependency on 2.6+, especially considering that at the time of writing this it's still in development.

require 'qo' # gem install qo @ v0.3.0

case ['Foo', 25]
when Qo[/^F/, Any] then true
else false
end
# => true

case {id: 1, name: 'foo', age: 42}
when Qo[id: Any, name: /^f/, age: Any] then true
else false
end
# => true

case {id: 1, name: 'foo'}
when Qo[id: Any, name: /^f/, age: Any] then true
else false
end
# => false

Qo behaves much like the proposals, except in that it's permissive for Arrays of mismatched lengths and works with Objects.

In 2.6+, assuming the two above are accepted, you could do this:

case ['Foo', 25]
when [/^F/, Any] then true
else false
end
# => true

case {id: 1, name: 'foo', age: 42}
when {id: Any, name: /^f/, age: Any} then true
else false
end
# => true

case {id: 1, name: 'foo'}
when {id: Any, name: /^f/, age: Any} then true
else false
end
# => false

Add this line to your application's Gemfile:

gem 'any'

And then execute:

$ bundle

Or install it yourself as:

$ gem install any

Bug reports and pull requests are welcome on GitHub at https://github.com/baweaver/any. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Any project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.