Inject a two-dimensional array to set : to String « Array « Ruby

1. Ruby
2. Array
3. to String

Inject a two-dimensional array to set

require 'set'
games = [["Alice", "Bob"], ["Carol", "Ted"],
         ["Alice", "Mallory"], ["Ted", "Bob"]]
p players = games.inject(Set.new) { |set, game| game.each { |p| set << p }; set }
# => #<Set: {"Alice", "Mallory", "Ted", "Carol", "Bob"}>

p players << "Ted"
# => #<Set: {"Alice", "Mallory", "Ted", "Carol", "Bob"}>

 

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