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instance method

Random::Formatter#alphanumeric

alphanumeric(n=nil)

# File tmp/rubies/ruby-3.0.5/lib/securerandom.rb, line 310
def alphanumeric(n=nil)
  n = 16 if n.nil?
  choose(ALPHANUMERIC, n)
end

SecureRandom.alphanumeric generates a random alphanumeric string.

The argument n specifies the length, in characters, of the alphanumeric string to be generated.

If n is not specified or is nil, 16 is assumed. It may be larger in the future.

The result may contain A-Z, a-z and 0-9.

Example

require 'securerandom'

SecureRandom.alphanumeric     #=> "2BuBuLf3WfSKyQbR"
SecureRandom.alphanumeric(10) #=> "i6K93NdqiH"

If a secure random number generator is not available, NotImplementedError is raised.

See also #base64 #choose also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1