How to generate a random number between a and b in Ruby?

UPDATE: Ruby 1.9.3 Kernel#rand also accepts ranges

rand(a..b)

Converting to array may be too expensive, and it's unnecessary.

(a..b).to_a.sample

[*a..b].sample

Standard in Ruby 1.8.7+.
Note: was named #choice in 1.8.7 and renamed in later versions.

But anyway, generating array need resources, and solution you already wrote is the best, you can do.

ruby random range

Random.new.rand(a..b)

Where a is your lowest value and b is your highest value.

ruby random range

rand(3..10)

When max is a Range, rand returns a random number where range.member?(number) == true.

CodeHunter