Generates random password in easy-to-remember combinations

passcode-generator.rb

#!/usr/bin/ruby
#set amount of letters and numbers in passcode
num_len = 4
alpha_len = 4
#fill up alphabet array
a=[]
("a".."z").each {|v| a<<v}
#fill up number array
n=[]
("0".."9").each {|v| n<<v}

#generate passcode
code = []
if Random.new.rand >= 0.5  #letters then numbers
	alpha_len.times { code << a[(Random.new.rand*a.size).to_i] }
	num_len.times { code << n[(Random.new.rand*n.size).to_i] }
else  #numbers then letters
	num_len.times { code << n[(Random.new.rand*n.size).to_i] }
	alpha_len.times { code << a[(Random.new.rand*a.size).to_i] }
end
puts code.join("")

total_codes = ((a.size**alpha_len)*(n.size**num_len)*2)
puts "total possible codes: #{total_codes}"