instance method
Random::Formatter#choose
choose(source, n)
lib/random/formatter.rb
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# File tmp/rubies/ruby-4.0.0/lib/random/formatter.rb, line 312
def choose(source, n)
size = source.size
m = 1
limit = size
while limit * size <= 0x100000000
limit *= size
m += 1
end
result = ''.dup
while m <= n
rs = random_number(limit)
is = rs.digits(size)
(m-is.length).times { is << 0 }
result << source.values_at(*is).join('')
n -= m
end
if 0 < n
rs = random_number(limit)
is = rs.digits(size)
if is.length < n
(n-is.length).times { is << 0 }
else
is.pop while n < is.length
end
result.concat source.values_at(*is).join('')
end
result
end
Generate a string that randomly draws from a source array of characters.
The argument source specifies the array of characters from which to generate the string. The argument n specifies the length, in characters, of the string to be generated.
The result may contain whatever characters are in the source array.
Example
require 'random/formatter' prng.choose([*'l'..'r'], 16) #=> "lmrqpoonmmlqlron" prng.choose([*'0'..'9'], 5) #=> "27309"