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def string_literal

  +"string_literal"

end

def interpolated_string

  underscore = -"_"

  "interpolated#{underscore}string"

end

def string_times_3

  "string times 3 " * 3

end

def string_times_1

  "string times 1" * 1

end

def string_add

  "string" + " " + "add"

end

def appended_string

  str = "string"

  str << " append"

  str

end

def string_arr

  [string_literal, string_times_1, string_times_3, interpolated_string, string_add, appended_string]

end

def fstring_arr

  string_arr.each{|str| -str}

end

def print_hash_key_count n = 100

  n.times.collect{ string_arr.each.with_object({}){|str, hsh| hsh[str] = nil}.keys }.transpose.each do |str_arrs|

    puts "#{str_arrs.first} => #{str_arrs.uniq(&:__id__).count}"

  end

end

print_hash_key_count

puts "-+" * 20

puts "fstring"

puts "-+" * 20

fstring_arr

print_hash_key_count

puts "-+" * 20

puts "fstring + GC"

puts "-+" * 20

fstring_arr

GC.start

print_hash_key_count