Generate Unique Random String With Letters And Numbers In Lower Case

Question

How can I fix this code so it generates unique random letters and numbers in lower case?

api_string = (0...32).map{65.+(rand(25)).chr}.join    

Answer 1

Process.clock_gettime(Process::CLOCK_REALTIME, :nanosecond).to_s(36)

Answer 2

((('a'..'z').to_a + (0..9).to_a)*3).shuffle[0,(rand(100).to_i)].join

Replace rand(100) with rand(n) where n is the maximum length of your desired string.

Answer 3

i forgot from where, but i've read this somehow this morning

l,m = 24,36
rand(m**l).to_s(m).rjust(l,'0')

it create random number from 0 to power(36,24), then convert it to base-36 string (that is 0-9 and a-z)

Answer 4

This will generate a lower random string from 32 to 50 characters including numbers and letters, both:

require 'string_pattern'

puts "32-50:/xN/".gen

Answer 5

Newer versions of Ruby support SecureRandom.base58, which will get you much denser tokens than hex, without any special characters.

> SecureRandom.base58(24)
> "Zp9N4aYvQfz3E6CmEzkadoa2"