String Vs Symbol Hashes

string_v_symbol_hashes.rb

require 'benchmark'

n = 100_000

Benchmark.bm do |x|
  x.report("string_hash:")   do
    n.times do
      string_hash = {"test" => "some string"}
      string_hash["test"]
    end
  end

  x.report(:"symbol_hash:")   do
    n.times do
      symbol_hash = {:test => :"some symbol"}
      symbol_hash[:test]
    end
  end

  x.report(:":mixed_hash:")   do
    n.times do
      symbol_hash = {:test => "some symbol"}
      symbol_hash[:test]
    end
  end
end

# Same string 3 times uses 3 objects
3.times { puts 'this is a string'.object_id}
# Same symbol 3 times uses 1 object
3.times { puts :'this is a string'.object_id}