How do I generate a random 10 digit number in ruby?

ruby random

To generate the number call rand with the result of the expression "10 to the power of 10"

rand(10 ** 10)

To pad the number with zeros you can use the string format operator

'%010d' % rand(10 ** 10)

or the rjust method of string

rand(10 ** 10).to_s.rjust(10,'0')

ruby random

I would like to contribute probably a simplest solution I know, which is a quite a good trick.

rand.to_s[2..11]  => "5950281724"

ruby random

This is a fast way to generate a 10-sized string of digits:

10.times.map{rand(10)}.join # => "3401487670"

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