Ruby hash.keys.index vs hash.has_key?

gistfile1.txt

Calculating -------------------------------------
          keys.index      1794 i/100ms
            has_key?      1822 i/100ms
-------------------------------------------------
          keys.index  4036912.9 (±10.4%) i/s -    8691930 in   2.275054s
            has_key?  6605458.9 (±9.1%) i/s -   25340376 in   3.878441s

Comparison:
            has_key?:  6605458.9 i/s
          keys.index:  4036912.9 i/s - 1.64x slower

keys_check_benchmark.rb

hash = { foo: 1, bar: 2, dar: 3 }
Benchmark.ips do |x|
  x.report("keys.index") {
    hash.keys.index(:foo)
  }
  x.report("has_key?") {
    hash.has_key?(:foo)
  }
  x.compare!
end