Question

The script has to verify if one predefined IP is present in a big array of IPs. Currently I code that function like this (saying that “ips” is my array of IP and “ip” is the predefined ip)

ips.each do |existsip|
  if ip == existsip
    puts "ip exists"
    return 1
  end
end
puts "ip doesn't exist"
return nil

Is there a faster way to do the same thing?

Edit : I might have wrongly expressed myself. I can do array.include? but what I’d like to know is : Is array.include? the method that will give me the fastest result?

Answer 1

You can use Set. It is implemented on top of Hash and will be faster for big datasets – O(1).

require 'set'
s = Set.new ['1.1.1.1', '1.2.3.4']
# => #<Set: {"1.1.1.1", "1.2.3.4"}> 
s.include? '1.1.1.1'
# => true