4 Matching Annotations
  1. Aug 2021
    1. # And standalone like a case:Qo.match(people.first, Qo.m(age: 10..19) { |person| "#{person.name} is a teen that's #{person.age} years old" }, Qo.m(:*) { |person| "#{person.name} is #{person.age} years old" })
    2. # How about some "right-hand assignment" pattern matchingname_longer_than_three = -> person { person.name.size > 3 }people_with_truncated_names = people.map(&Qo.match_fn( Qo.m(name_longer_than_three) { |person| Person.new(person.name[0..2], person.age) }, Qo.m(:*) # Identity function, catch-all))
  2. Jul 2021
    1. In the examples above, the number 42 on the left hand side isn’t a variable that is being assigned. It is a value to check that the same element in that particular index matches that of the right hand side.