Don't Convert Arrays to Sets for Inclusion Checks

to_set_performance.rb

ids = (1..1_000_000).to_a; nil
x = rand(1_000_000)

Benchmark.realtime do
  10.times do
    ids.to_set.include?(x)
  end
end
# => 14.3837828636169

Benchmark.realtime do
  the_set = ids.to_set
  10.times do
    the_set.include?(x)
  end
end
# => 1.35075497627258

Benchmark.realtime do
  10.times do
    ids.include?(x)
  end
end
# => 0.142719984054565