Today I Learned

A Hashrocket project

So you heard about Ruby 2.7 Pattern Matching?

Ruby has an experimental feature “Pattern Matching” introduced in this latest release, 2.7.

When I think pattern matching I think function arguments but for Ruby this is not the case. Instead, pattern matching is all about the case statement.

When I open up a 2.7 irb repl I can do this:

irb(main):001:0> case [1, 2]; in [1, x]; puts "x: #{x}"; end
(irb):5: warning: Pattern matching is experimental, and the behavior may change in future versions of Ruby!
x: 2
=> nil

Yep, it’s experimental. Seems like you shouldn’t use it in production code 😡.

There it is! Check out a slide deck with more info here

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