Hypothetical pattern-matching API in Ruby.

gistfile1.txt

(1..100).match do |i|
  pattern(i%3, i%5) {
    match [0, 0], "FizzBuzz"    # match i%3 == 0, i%5 == 0
    match [0, _], "Fizz"        # match i%3 == 0, i%5 == anything
    match [_, 0], "Buzz"        # match i%3 == anything, i%5 == 0
  }
end
# => [nil, nil, "Fizz", nil, "Buzz", "Fizz", ...]