mapped types syntax and intro
a tweet that prompted the idea for the talk
https://twitter.com/kentcdodds/status/1608187990215655424
but since this isn't possible with satisfies (it doesn't participate in inference, in an example like that it only provides contextual types) the answer was to use a function with a reverse mapped type
| time = Time.mktime(2014, 10, 14, 12, 1) | |
| allowed_ranges = [ | |
| [11, 59]..[12, 1], | |
| ] | |
| formatted_time = [time.hour, time.min] | |
| p allowed_ranges.any? { |range| range.cover?(formatted_time) } |
| source :rubygems | |
| gem 'rake' | |
| gem 'rspec', '2.12.0' | |
| gem 'rcov' |
| # Video: http://confreaks.com/videos/499-rubyhoedown2008-keynote | |
| Hi everyone, I'm Chris Wanstrath. | |
| When Jeremy asked me to come talk, I said yes. Hell yes. Immediately. But | |
| then I took a few moments and thought, Wait, why? Why me? What am I supposed | |
| to say that's interesting? Something about Ruby, perhaps. Maybe the | |
| future of it. The future of something, at least. That sounds | |
| keynote-y. |
| class GroupOfThingies | |
| attr_accessor :thingies | |
| # Use like this: | |
| # | |
| # group_of_thingies = GroupOfThingies.new | |
| # group_of_thingies.each do |thing| | |
| # puts "Check out this awesome thing: #{thing}!" | |
| # end | |
| # |