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

All letters and digits, that's how numbers are represented in base 36.

api_string = Array.new(32){rand(36).to_s(36)}.join

Answer 2

using SecureRandom of ruby language.

require 'securerandom' randomstring = SecureRandom.hex(5)

It will generate the n*2 random string contains “0-9″ and “a-f”

Answer 3

Here's one way to do it:

POSSIBLE = (('A'..'Z').to_a + (0..9).to_a)
api_string = (0...32).map { |n| POSSIBLE.sample }.join

If you have Active Support available you can also do this to make an API-key-like string:

ActiveSupport::SecureRandom.hex(32)

Answer 4

CHARS = (?0..?9).to_a + (?a..?z).to_a
api_string = 32.times.inject("") {|s, i| s << CHARS[rand(CHARS.size)]}

Answer 5

If you are using ruby 1.9.2 you can use SecureRandom:

irb(main):001:0> require 'securerandom'
=> true
irb(main):002:0> SecureRandom.hex(13)
=> "5bbf194bcf8740ae8c9ce49e97"
irb(main):003:0> SecureRandom.hex(15)
=> "d2413503a9618bacfdb1745eafdb0f"
irb(main):004:0> SecureRandom.hex(32)
=> "432e0a359bbf3669e6da610d57ea5d0cd9e2fceb93e7f7989305d89e31073690"

Answer 6

8.times.map { [*'0'..'9', *'a'..'z'].sample }.join