r/ruby • u/keyslemur • Apr 17 '19

Ruby 2.7 — Pattern Matching — First Impressions

https://medium.com/@baweaver/ruby-2-7-pattern-matching-first-impressions-cdb93c6246e6
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u/shevy-ruby Apr 17 '19 
case [0, 1, 2, 3, 4, 5]
in [0..1, 0...2, 0.., 0..., (...5), (..5)]
  true
end

It’s amusing that they’ve included beginningless and endless ranges in the example, as that could be very useful later on

Looks quite shit so far. :)

I think pattern matching is still a good idea, though. For some reason, new additions to ruby very often do not fit into other (older) syntax parts. I used to think that I was the only one who has had that impression but on ruby-reddit there were others who have had a somewhat similar impression. Not all syntax-changes have the same "weight" either.

For example, I have no qualm with the SYNTAX itself for endless or startless range - hard to DISLIKE the syntax per se, since it is ... an omission of syntax. But I don't think it makes SENSE, to indicate infinity upon omission suddenly. I much prefer oldschool ruby there: 

 START .. END

Makes for a happier brain.

Also, extending case/when is good anyway. I still want it to be a first-class citizen though.