Put contents of array all at once - ruby

Question

I don't understand why this won't do what the title states.
#!/usr/bin/env ruby
require 'socket'
require 'timeout'
class Scanner
def initialize(host, port)
#host = host
#port = port
end
def popen
begin
array = []
sock = Socket.new(:INET, :STREAM)
sockaddr = Socket.sockaddr_in(#port, #host)
Timeout::timeout(5) do
array.push("Port #{#port}: Open") if sock.connect(sockaddr)
end
puts array
rescue Timeout::Error
puts "Port #{#port}: Filtered"
rescue Errno::ECONNREFUSED
end
end
end # end Scanner
def main
begin
p = 1
case ARGV[0]
when '-p'
eport = ARGV[1]
host = ARGV[2]
else
eport = 65535
host = ARGV[0]
end
t1 = Time.now
puts "\n"
puts "-" * 70
puts "Scanning #{host}..."
puts "-" * 70
while p <= eport.to_i do
scan = Scanner.new(host, p)
scan.popen
p += 1
end
t2 = Time.now
time = t2 - t1
puts "\nScan completed: #{host} scanned in #{time} seconds."
rescue Errno::EHOSTUNREACH
puts "This host appears to be unreachable"
rescue Interrupt
puts "onnection terminated."
end
end
main
What I'm trying to achieve is an output similar to nmap, in the way that it scans everything, and then shows all open or closed ports at the end. Instead what happens is that it prints them out as it discovers them. I figured pushing the output into an array then printing the array would achieve such an output, yet it still prints out the ports one at a time. Why is this happening?
Also, I apologize for the formatting, the code tags are a little weird.

Answer 1

Your loop calls popen once per iteration. Your popen method sets array = [] each time it is called, then populates it with one item, then you print it with puts. On the next loop iteration, you reset array to [] and do it all again.
You only asked "why," but – you could solve this by setting array just once in the body of main and then passing it to popen (or any number of ways).